I. Introduction

A child’s surname is not merely a label. In Philippine law, it is tied to civil status, filiation, parental authority, legitimacy, succession, identity, and public records. Because of this, changing or withdrawing a child’s use of the father’s surname is not treated as a simple personal preference. It is governed by the Civil Code, the Family Code, the Civil Register Law, Republic Act No. 9255, the Rules of Court, and administrative issuances of the Philippine Statistics Authority and the Office of the Civil Registrar General.

The issue usually arises in cases involving illegitimate children, separated parents, absent fathers, fathers who acknowledged the child but later became abusive or uninvolved, mothers who want the child to use the maternal surname, or children who, upon reaching maturity, no longer wish to carry the surname of a father with whom they have no meaningful relationship.

The governing principle is that a child’s name is part of civil status and public identity. It cannot be changed casually, privately, or by mere agreement of the parents. Where the change affects the child’s surname, filiation, legitimacy, or paternal acknowledgment, court action is usually required.

II. Names, Surnames, and Civil Status in Philippine Law

Under Philippine law, a person’s name consists of a given name, middle name, and surname. The surname generally reflects family lineage.

For legitimate children, the surname is usually that of the father. This follows the general rule that legitimate children principally use the surname of the father.

For illegitimate children, the rule is different. The default rule is that an illegitimate child uses the surname of the mother. However, under Republic Act No. 9255, an illegitimate child may use the surname of the father if the father expressly recognizes the child in accordance with law.

This distinction is crucial. A legitimate child’s use of the father’s surname flows from legitimate filiation. An illegitimate child’s use of the father’s surname is generally permissive and dependent on valid paternal recognition.

III. Legitimate Children and the Father’s Surname

A legitimate child is one conceived or born during a valid marriage, subject to the rules on legitimacy under the Family Code. A legitimate child generally has the right to use the surname of the father and the mother, receive support, and inherit from both parents.

Because the surname of a legitimate child is connected to legitimacy and filiation, changing it is not a simple administrative correction. A legitimate child cannot ordinarily drop the father’s surname merely because the parents separated, the father is absent, the father failed to provide support, or the child prefers the mother’s surname.

Separation of the parents does not erase paternal filiation. Annulment, declaration of nullity, legal separation, or de facto abandonment does not automatically remove the father’s name or surname from the child’s civil registry record.

A legitimate child who seeks to change the surname must generally file a petition for change of name under Rule 103 of the Rules of Court, unless the matter involves only a clerical or typographical error covered by administrative correction laws. The court will determine whether there is a proper and compelling reason to allow the change.

IV. Illegitimate Children and the Mother’s Surname as the Default Rule

An illegitimate child is one conceived and born outside a valid marriage, except in situations where the law grants legitimacy or legitimation.

As a rule, an illegitimate child uses the surname of the mother. This is the default position under Article 176 of the Family Code, as amended by Republic Act No. 9255.

Before the amendment introduced by Republic Act No. 9255, illegitimate children generally used the surname of the mother. RA 9255 allowed an illegitimate child to use the father’s surname if the father expressly recognized the child.

The wording is important: the law allows the child to use the father’s surname. It does not automatically require the child to do so in every case.

V. Republic Act No. 9255: Use of the Father’s Surname by an Illegitimate Child

Republic Act No. 9255 amended Article 176 of the Family Code. It provides that illegitimate children shall use the surname and shall be under the parental authority of the mother, and shall be entitled to support in conformity with the Family Code. However, they may use the surname of the father if their filiation has been expressly recognized by the father through the record of birth appearing in the civil register, or when an admission in a public document or private handwritten instrument is made by the father.

In practical terms, an illegitimate child may use the father’s surname if there is valid acknowledgment by the father through any of the recognized modes, such as:

The father signed the birth certificate acknowledging the child;
The father executed an affidavit of acknowledgment or admission of paternity;
The father made an admission in a public document;
The father made an admission in a private handwritten instrument;
The requirements under the implementing rules of RA 9255 were complied with.

The child’s use of the father’s surname is commonly implemented through an Affidavit to Use the Surname of the Father, often referred to as an AUSF.

VI. The Affidavit to Use the Surname of the Father

The Affidavit to Use the Surname of the Father is the document used to allow an illegitimate child to use the father’s surname when the father has validly acknowledged the child.

Who executes the affidavit depends on the age and circumstances of the child.

If the child is still a minor, the mother or guardian usually executes the affidavit. If the child has reached the age required under applicable civil registry rules, the child’s own consent or execution may be required. If the child is already of age, the child may execute the affidavit personally.

The AUSF does not make the child legitimate. It does not transfer parental authority to the father. It does not by itself give the father custody. It does not erase the mother’s parental authority over an illegitimate child. It mainly affects the surname that the child may use in the civil registry.

This is a common misunderstanding. Allowing an illegitimate child to use the father’s surname is not the same as making the child legitimate. The child remains illegitimate unless legitimated by subsequent valid marriage of the parents, where allowed by law, or unless legitimacy is otherwise established under the Family Code.

VII. Can the Use of the Father’s Surname Be Withdrawn?

The answer depends on the situation.

For an illegitimate child who was allowed to use the father’s surname under RA 9255, withdrawal or change back to the mother’s surname is not always a simple administrative matter. Once the civil registry record has been amended to reflect the father’s surname, that surname becomes part of the child’s official civil registry record.

If the change sought is substantial, such as changing the child’s surname from the father’s surname back to the mother’s surname, a court petition is generally required. The local civil registrar cannot simply undo the use of the father’s surname on the basis of a parent’s later change of mind.

The reason is that a surname affects civil status, identity, and filiation. Administrative correction is generally limited to clerical or typographical errors and certain specified changes under special laws. A deliberate change of surname is usually judicial in nature.

VIII. Administrative Correction vs. Judicial Change of Name

Philippine law distinguishes between simple corrections and substantial changes.

Administrative correction may be available for clerical or typographical errors, such as misspellings, wrong entries that are obvious on the face of the record, or certain changes expressly allowed by law.

Judicial change of name is required when the change is substantial. A change of surname is generally considered substantial because it affects identity, lineage, and civil status.

Therefore, changing a child’s surname from the father’s surname to the mother’s surname, or removing the father’s surname from official records, will usually require a petition in court.

The relevant remedies may include:

Petition for change of name under Rule 103 of the Rules of Court;
Petition for cancellation or correction of entries under Rule 108 of the Rules of Court;
In some cases, a combined petition under Rules 103 and 108;
In cases involving disputed filiation, an action directly addressing paternity or filiation.

The correct remedy depends on whether the requested change involves only the name, the civil registry entry, the fact of paternal acknowledgment, or the child’s filiation.

IX. Rule 103: Petition for Change of Name

Rule 103 governs petitions for change of name. It applies when a person seeks to legally change a name or surname.

A petition for change of name must usually be filed in the Regional Trial Court of the province or city where the petitioner resides. The petition must state the petitioner’s current name, the name sought to be adopted, the reason for the change, and other required personal circumstances.

For a minor child, the petition is usually filed by a parent or legal guardian on the child’s behalf.

The court will require publication of the order setting the petition for hearing. This allows interested persons, including the State, the civil registrar, and persons who may be affected, to oppose the petition.

Change of name is not a matter of right. It is discretionary upon the court. The petitioner must show proper and reasonable cause.

Common grounds recognized in jurisprudence for change of name include:

The name is ridiculous, dishonorable, or extremely difficult to write or pronounce;
The change will avoid confusion;
The change is necessary because the person has continuously used and been known by another name;
The change will prevent prejudice or embarrassment;
The change is justified by compelling circumstances;
The change serves the best interests of the child.

In cases involving a child’s surname, the court will especially consider the welfare and best interests of the child.

X. Rule 108: Correction or Cancellation of Civil Registry Entries

Rule 108 applies to correction or cancellation of entries in the civil registry. It is used when the civil registry record itself must be changed.

If the child’s birth certificate already reflects the father’s surname, and the objective is to correct, cancel, modify, or annotate the entry, Rule 108 may be necessary.

Rule 108 proceedings are adversarial when the correction is substantial. This means affected parties must be notified and given an opportunity to be heard. The civil registrar and the Solicitor General may be involved, and publication may be required.

If the petition seeks to delete the father’s surname, remove paternal information, or alter an entry connected to filiation, the case is likely substantial and cannot be treated as a mere clerical correction.

XI. When the Father’s Acknowledgment Was Defective or Invalid

A different issue arises when the father’s surname was used because of an allegedly defective acknowledgment.

Examples include:

The father did not actually sign the birth certificate;
The signature was forged;
The acknowledgment was made without legal authority;
The AUSF was improperly executed;
The father’s identity was incorrectly entered;
The birth certificate contains false information;
The father was listed without valid acknowledgment.

In such cases, the remedy may not simply be “withdrawal” of the father’s surname. The proper action may involve correction or cancellation of civil registry entries under Rule 108, possibly with issues of paternity, fraud, falsification, or filiation.

If the father did not validly acknowledge the child, then the legal basis for the child’s use of the father’s surname may be questioned. However, because the birth certificate is an official civil registry record, the correction still generally requires proper legal proceedings.

XII. When the Father Later Disowns the Child

A father who previously acknowledged an illegitimate child cannot casually withdraw acknowledgment merely because he changed his mind.

Recognition of a child has legal consequences. Once filiation is admitted in a manner recognized by law, the father cannot simply revoke it privately. If he claims that acknowledgment was made through mistake, fraud, intimidation, or other invalidating circumstances, he must go to court.

Likewise, the civil registrar cannot remove the father’s name or surname solely because the father now refuses to be associated with the child.

The law protects the child’s status and identity from instability. Paternal acknowledgment, once officially reflected in civil registry records, cannot be undone by informal withdrawal.

XIII. When the Mother Wants to Remove the Father’s Surname

A mother may want to remove the father’s surname for several reasons: abandonment, lack of support, abuse, separation, absence of relationship, or the desire for the child to carry the maternal family name.

However, the mother’s preference alone is usually insufficient. The court will look at the child’s best interests, the legal basis for the current surname, the child’s age, the child’s established identity, the existence of paternal acknowledgment, and whether the change will create or avoid confusion.

For an illegitimate child, the mother has sole parental authority under the Family Code. But sole parental authority does not automatically include unilateral power to alter the child’s civil registry surname after it has already been legally recorded.

If the child has long used the mother’s surname in school, medical records, community life, and government documents, that may support a petition to conform the official record to the child’s known identity. Conversely, if the child has long used the father’s surname, the court may require stronger justification before allowing a change.

XIV. When the Child Wants to Stop Using the Father’s Surname

A child who has reached majority may personally seek a change of name. The petition must still be filed in court if the change is substantial.

The court may consider the adult child’s reasons, such as abandonment, absence of relationship with the father, emotional harm, continuous use of the mother’s surname, avoidance of confusion, or the desire to align legal identity with actual family life.

However, personal dislike of the father’s surname may not always be enough. Courts generally require a legitimate, reasonable, and compelling ground.

The stronger the showing that the change will prevent confusion, protect the person’s welfare, or reflect long-standing actual use, the better the chance of approval.

XV. Effect of Using the Father’s Surname on Parental Authority

For illegitimate children, use of the father’s surname does not transfer parental authority to the father.

Article 176 of the Family Code provides that illegitimate children are under the parental authority of the mother. Even if the child uses the father’s surname under RA 9255, the mother remains the parent with parental authority, unless a court orders otherwise in a proper case.

This means the father’s surname does not automatically give the father custody, decision-making control, or equal parental authority over the illegitimate child.

However, the father may still have obligations and rights connected to filiation, including support and, in appropriate cases, visitation or access consistent with the child’s welfare.

XVI. Effect on Support

Changing or withdrawing the use of the father’s surname does not automatically extinguish the father’s obligation to support the child.

Support is based on filiation, not merely on surname. If the father is legally established as the parent, he may be required to provide support even if the child uses the mother’s surname.

Conversely, allowing a child to use the father’s surname may help establish or reflect paternal acknowledgment, which may support a claim for support.

A petition to change the child’s surname should not be confused with a petition for support. These are different legal matters, although they may involve related facts.

XVII. Effect on Inheritance

Surname and inheritance are also distinct.

A child’s right to inherit from the father depends on filiation and legitimacy or illegitimacy, not merely on the surname used.

An illegitimate child recognized by the father may have successional rights under the Civil Code, even if the child uses the mother’s surname. Likewise, the use of the father’s surname may evidence recognition but is not, by itself, the full measure of inheritance rights.

Changing the surname from the father’s surname to the mother’s surname does not necessarily erase filiation or inheritance rights, unless the proceeding also affects or cancels the legal basis of paternal recognition.

This distinction matters. A child may stop using the father’s surname but still remain legally recognized as the father’s child.

XVIII. Effect on the Birth Certificate

The birth certificate is the primary civil registry document affected by a surname change.

If the birth certificate originally listed the child under the mother’s surname and the child later used the father’s surname under RA 9255, the civil registrar may annotate or update the record according to civil registry rules.

If the child later seeks to revert to the mother’s surname, the birth certificate may need to be corrected or annotated through judicial proceedings.

A court order, once final, is submitted to the local civil registrar and the Philippine Statistics Authority for annotation or implementation.

The original record is usually not physically erased. Instead, the civil registry record is annotated to reflect the judicially approved change.

XIX. Middle Name Issues

In the Philippines, the middle name traditionally reflects the mother’s maiden surname, while the surname reflects the father’s surname for legitimate children.

For illegitimate children using the mother’s surname, middle name issues may become complicated. An illegitimate child using the mother’s surname may not necessarily have the same middle-name structure as a legitimate child. When the father’s surname is used under RA 9255, the child’s middle name and surname may be affected by civil registry rules.

If the child stops using the father’s surname and reverts to the mother’s surname, the middle name may also require adjustment. This is another reason why court proceedings or proper civil registry processing may be necessary.

XX. Legitimation and Its Effect on Surname

Legitimation occurs when a child who was originally illegitimate becomes legitimate by operation of law due to the subsequent valid marriage of the parents, provided the legal requirements are met.

If a child is legitimated, the child generally becomes entitled to the rights of a legitimate child, including use of the father’s surname.

After legitimation, changing away from the father’s surname becomes more difficult because the surname is now tied to legitimate status, not merely permissive use under RA 9255.

If the parents later separate, the legitimation is not undone. The child does not become illegitimate again because the parents separated.

XXI. Adoption and Change of Surname

Adoption is a separate legal process. Once a child is adopted, the adopters generally become the child’s legal parents, and the child may use the surname of the adopter or adopters.

If a child is adopted by the mother’s spouse, or by another person, the child’s surname may change as part of the adoption decree.

In such cases, the change of surname does not arise merely from withdrawing the father’s surname. It arises from the legal effect of adoption.

Adoption also affects parental authority, custody, and succession in ways that a simple change of surname does not.

XXII. Domestic Violence, Abuse, or Abandonment by the Father

Cases involving violence, abuse, abandonment, or serious neglect require special care.

A father’s failure to support, abandonment, or abusive conduct may support a petition to change the child’s surname if the petitioner can show that continued use of the father’s surname is harmful, prejudicial, or contrary to the child’s best interests.

However, even serious misconduct by the father does not automatically change the child’s surname. The remedy must still be pursued through the proper legal process.

Where abuse is involved, separate remedies may also be available under laws on violence against women and children, child protection, custody, support, protection orders, and criminal law. A surname change may be only one part of a broader legal response.

XXIII. Best Interests of the Child

The best interests of the child is a central principle in cases involving minors.

In deciding whether to allow a change or withdrawal of the father’s surname, a court may consider:

The child’s age;
The child’s emotional and psychological welfare;
The child’s relationship with the father;
The child’s relationship with the mother;
The surname the child has actually used in school and daily life;
Possible confusion in records;
Whether the change will protect the child from stigma, harm, or embarrassment;
Whether the change is being sought for a legitimate reason;
Whether the petition is motivated by parental conflict rather than the child’s welfare;
The child’s own preference, especially if mature enough to express it.

The court will not treat the child’s surname as a weapon in parental disputes. The focus is the child’s welfare, not the resentment of one parent against the other.

XXIV. Common Scenarios

1. The child was born illegitimate and uses the mother’s surname.

No withdrawal is needed because the child is already using the default surname. If the father later wants the child to use his surname, valid acknowledgment and compliance with RA 9255 are required.

2. The child was born illegitimate and later used the father’s surname through AUSF.

Changing back to the mother’s surname will usually require judicial action if the civil registry record has already been amended or annotated.

3. The father signed the birth certificate but later abandoned the child.

The father’s abandonment does not automatically cancel his acknowledgment or remove his surname. A court petition is generally required to change the surname.

4. The mother listed the father without his valid acknowledgment.

If the father did not validly acknowledge the child, the civil registry entry may be questioned. The remedy may involve Rule 108 and issues of correction or cancellation of entries.

5. The child is legitimate but wants to use the mother’s surname.

A legitimate child generally uses the father’s surname. A petition for change of name under Rule 103 is usually required, and the court must find sufficient reason.

6. The child is now an adult and wants to drop the father’s surname.

The adult child may file a petition for change of name. The court will require proper grounds and compliance with procedural requirements.

7. The father wants to remove his surname from the child’s records.

He cannot do so unilaterally. If he disputes paternity or acknowledgment, he must pursue the proper judicial remedy.

8. The child has always used the mother’s surname in school, but the birth certificate uses the father’s surname.

A petition may be filed to align the official record with actual use, but the court will examine the reason and the effect on the child’s identity and civil status.

XXV. Procedure for Changing or Withdrawing the Father’s Surname

The usual process involves the following steps:

1. Determine the child’s status.

The first question is whether the child is legitimate, illegitimate, legitimated, or adopted. The proper remedy depends heavily on status.

2. Examine the birth certificate.

The birth certificate should be reviewed to determine:

The surname currently recorded;
Whether the father is listed;
Whether the father signed or acknowledged the child;
Whether there is an annotation under RA 9255;
Whether there are prior corrections or annotations;
Whether the child’s records are consistent with actual use.

3. Determine whether the issue is clerical or substantial.

A simple typographical error may be administratively corrected. A change of surname is generally substantial and judicial.

4. Identify the proper petition.

Depending on the case, the remedy may be:

Rule 103 for change of name;
Rule 108 for correction or cancellation of civil registry entries;
Both Rule 103 and Rule 108;
A separate action involving filiation, paternity, support, custody, or adoption.

5. File the petition in court.

The petition is usually filed in the Regional Trial Court with jurisdiction over the petitioner’s residence or the place where the civil registry record is kept, depending on the nature of the petition.

6. Comply with publication and notice requirements.

The court generally requires publication and notice to affected parties. This protects the public interest in civil status records.

7. Attend the hearing and present evidence.

Evidence may include:

Birth certificate;
AUSF;
acknowledgment documents;
school records;
medical records;
government IDs;
proof of actual surname used;
proof of abandonment, abuse, or lack of relationship, if relevant;
testimony of the parent, guardian, or child;
psychological or social welfare evidence, if needed.

8. Obtain a court order.

If the petition is granted, the court issues an order approving the change.

9. Register and annotate the order.

The final court order must be registered with the local civil registrar and implemented through the Philippine Statistics Authority system.

XXVI. Evidence Usually Needed

The evidence depends on the facts, but commonly includes:

PSA-issued birth certificate;
local civil registry copy of the birth certificate;
acknowledgment documents signed by the father;
AUSF or related civil registry documents;
parents’ marriage certificate, if any;
certificate of no marriage, if relevant;
school records showing the surname actually used;
baptismal records, medical records, and government records;
proof of custody and parental authority;
proof of support or nonsupport;
communications showing acknowledgment or abandonment;
affidavits from persons familiar with the child’s identity;
child’s statement or preference, where appropriate;
proof that the change will serve the child’s welfare.

In a case involving alleged fraud or invalid acknowledgment, additional evidence may be required, including handwriting evidence, testimony, or DNA-related evidence in appropriate proceedings.

XXVII. Important Distinctions

Surname is not the same as filiation.

A child may use the mother’s surname and still be legally recognized as the father’s child.

Surname is not the same as custody.

A father’s surname does not automatically give custody or parental authority over an illegitimate child.

Surname is not the same as support.

A father’s duty to support depends on filiation, not merely on whether the child uses his surname.

Surname is not the same as legitimacy.

An illegitimate child who uses the father’s surname does not become legitimate by that fact alone.

A birth certificate is not casually editable.

Once a surname appears in the civil registry, substantial changes generally require court action.

XXVIII. Legal Consequences of Changing Back to the Mother’s Surname

Changing or withdrawing the father’s surname may have practical and legal consequences.

It may affect:

school records;
passports;
government IDs;
medical records;
bank records;
insurance records;
inheritance documentation;
immigration records;
travel documents;
consistency of identity across institutions.

However, the change does not necessarily erase paternal filiation, support rights, or inheritance rights unless the court order specifically affects those matters.

Care must be taken to avoid unintended consequences. A petition should clearly state whether the objective is only to change the surname or also to correct entries relating to paternity or acknowledgment.

XXIX. Can the Parents Agree Privately to Change the Child’s Surname?

A private agreement between the parents is not enough to change the child’s civil registry surname.

Parents may agree informally on what surname the child will use socially, but schools, government agencies, passport offices, and civil registrars generally rely on the official birth certificate and court orders.

A notarized agreement may serve as evidence of consent, but it does not replace the required legal procedure.

XXX. Can the Local Civil Registrar Simply Change the Surname?

Usually, no.

The local civil registrar may process certain administrative corrections and RA 9255 documents when requirements are met. But a change from the father’s surname back to the mother’s surname, especially after official annotation, is generally substantial.

Civil registrars are custodians of civil registry records. They do not have general power to decide contested issues of filiation, legitimacy, or substantial identity changes.

XXXI. Child’s Consent and Participation

The child’s participation depends on age and maturity.

For very young children, the parent or guardian acts on the child’s behalf. For older minors, the court may consider the child’s preference, especially when the child is mature enough to understand the issue.

For adults, the petition belongs to the person whose name is to be changed.

The child’s preference is important but not always controlling. The court still determines whether the legal requirements are met.

XXXII. Jurisprudential Principles

Philippine jurisprudence has consistently treated names as matters of public interest. A person’s name cannot be changed for trivial reasons. Courts require proper and reasonable cause.

The Supreme Court has also recognized that the use of the father’s surname by an illegitimate child under RA 9255 is permissive rather than mandatory. This means that an illegitimate child is allowed, but not absolutely compelled, to use the father’s surname when legally acknowledged.

Courts also recognize that changes affecting civil registry entries, especially those involving legitimacy, filiation, or surname, are substantial and generally require adversarial judicial proceedings.

The guiding principles are identity, stability of civil status, avoidance of fraud, protection of the child, and the public interest in accurate civil registry records.

XXXIII. Practical Problems in Surname Withdrawal

Several practical problems commonly arise:

Inconsistent records

A child may have a birth certificate using the father’s surname but school records using the mother’s surname, or vice versa. This can cause problems in enrollment, passport applications, board examinations, employment, banking, and travel.

Delay in PSA annotation

Even after a court order, implementation may take time because the order must pass through local civil registry and PSA processes.

Opposition by the father

If the father opposes the petition, the case may become contested. The court will hear both sides.

Confusion between name change and paternity

Some petitions fail because they are framed as a simple name change when the real issue is disputed filiation or invalid acknowledgment.

Emotional motives

Courts may be cautious when the petition appears motivated mainly by anger between parents rather than the child’s welfare.

XXXIV. Remedies Related to but Different from Surname Change

Changing or withdrawing the father’s surname is sometimes connected with other remedies, but each remedy has a different purpose.

Petition for support

Used to compel the father to provide financial support.

Custody case

Used to determine who should have care and custody of the child.

Protection order

Used in cases involving violence or abuse.

Petition to establish filiation

Used to prove that a person is the child of the alleged parent.

Petition to impugn legitimacy

Used in specific cases governed by strict rules and periods under the Family Code.

Adoption

Creates a new legal parent-child relationship and may change the child’s surname.

Administrative correction

Used only for errors that the law allows to be corrected administratively.

XXXV. Frequently Misunderstood Points

“The father abandoned the child, so the child can automatically stop using his surname.”

Not automatically. Abandonment may be a ground to support a petition, but official records still require proper legal action.

“The mother has sole parental authority, so she can remove the father’s surname.”

Not by herself once the surname is officially recorded. Sole parental authority over an illegitimate child does not equal unilateral power to alter the civil registry.

“The child uses the father’s surname, so the father has custody.”

No. For illegitimate children, parental authority belongs to the mother, even if the child uses the father’s surname.

“Removing the father’s surname removes the father’s obligation to support.”

No. Support depends on filiation.

“Using the father’s surname makes the child legitimate.”

No. It only reflects permission to use the surname based on recognition.

“A notarized affidavit is enough to change back to the mother’s surname.”

Usually no. A substantial change of surname generally requires a court order.

XXXVI. Policy Considerations

Philippine law balances several interests:

The child’s right to identity;
The mother’s parental authority over an illegitimate child;
The father’s legal relationship with a recognized child;
The State’s interest in stable and accurate civil registry records;
The prevention of fraud;
The child’s emotional and social welfare;
The child’s right to support and inheritance.

Because these interests overlap, the law does not allow casual alteration of surnames, especially in official records.

XXXVII. Conclusion

Changing or withdrawing a child’s use of the father’s surname in the Philippines depends primarily on the child’s status, the manner by which the father’s surname was acquired, and whether the requested change affects civil registry entries, filiation, or civil status.

For legitimate children, use of the father’s surname is the general rule, and changing it requires strong justification and court approval.

For illegitimate children, the mother’s surname is the default. The father’s surname may be used if the father validly acknowledges the child under RA 9255. But once the father’s surname is officially recorded or annotated, withdrawing it is generally not a simple administrative act. A judicial petition is usually required.

The most important point is that surname, filiation, custody, support, and legitimacy are related but distinct legal concepts. A child may stop using the father’s surname without necessarily losing support or inheritance rights, provided filiation remains legally recognized. Conversely, changing a surname does not by itself erase or create parental rights.

In every case, the court’s central concern is not the preference of either parent, but the child’s identity, welfare, and best interests, together with the public interest in truthful and stable civil registry records.