Changing Your Family Name in France
(Usage Name or Legal Surname)

In a landmark judgment delivered on February 22, 1994, the European Court of Human Rights defined an individual's name as: "a means of personal identification and a link to a family" (ECHR, Feb 22, 1994, Burghartz v. Switzerland, App. No. 16213/90).

This case law reflects the growing recognition of individual autonomy in personal identity. In France, this legal evolution has led to multiple statutory mechanisms allowing individuals to change both their daily usage name (nom d'usage) and their official legal surname (nom patronymique / nom de famille).

What Legal Remedies Exist to Modify a Child's Usage Name?

Statistically, 81.4% of children in France are registered at birth with only their father's surname. Following a divorce or separation, mothers frequently wish to add their birth name to their child's surname.

This is entirely permissible under French law. However, this addition operates as a usage name (nom d'usage). It does not alter the child's official birth certificate and cannot be passed on to subsequent generations.

A parent can thus add their birth surname to the child's surname as a double usage name.

The child can even choose to use only this usage name in daily administrative, school, and medical contexts. The parent wishing to add their name must formally notify the other parent. If the other parent objects, the matter must be submitted to the Family Court Judge (JAF), who will rule in the best interests of the child.

Note that adding a usage name strictly requires the consent of any child aged 13 or older.

Finally, this prerogative is reserved exclusively to parents exercising parental authority and is restricted to each parent's first birth surname.

What Legal Procedures Exist to Modify an Official Legal Surname?

Unlike a usage name, an official surname (nom de famille) is established by filiation and recorded permanently on civil status registers. Two legal routes exist to change it:

1. Name Change Based on Legitimate Interest (Motif Légitime)

When demonstrating a "legitimate interest" (motif d'intérêt légitime), an individual can petition the Ministry of Justice for an official change of surname. Emotional reasons can constitute legitimate grounds: for example, on April 28, 2022, the Paris Administrative Court of Appeal authorized an adult to substitute her paternal birth surname with her mother's surname, ruling that parental abandonment by the father when she was 18 months old constituted a legitimate interest (CAA Paris, 1st Ch., April 28, 2022, No. 21PA04890).

These petitions are examined and granted by official decree of the Ministry of Justice.

Other recognized legitimate grounds include:

• foreign-sounding surnames for assimilation purposes,
• vulgar, humiliating, or ridiculous surnames,
• surnames made infamous by historical or criminal notoriety causing prejudice,
• the preservation of an illustrious or dying family surname and maintaining family unity (Council of State, Feb 24, 2023, No. 465061).

2. Simplified Name Change for Adults (Law of March 2, 2022)

The Law of March 2, 2022 significantly simplified the procedure for adults. Any adult of French nationality can request a change of surname directly from the Civil Registry Officer (Mairie) without having to prove any "legitimate interest". A simple declaration at the town hall suffices.

This simplified administrative procedure applies exclusively to adults. This simplified surname change can only be exercised once in a lifetime.

Under this procedure, the applicant enjoys three statutory options:

• Adding the surname of the parent that was not transmitted at birth to form a hyphenated double surname.
• Retaining only one surname instead of the double surname received at birth.
• Replacing the birth surname entirely with the other parent's surname.

By Claire Quétand-Finet Family & Divorce Lawyer - Versailles Bar Association

PhD in Private Law · +10 years of experience in family & divorce law · University Lecturer for continuous legal expertise

See also:
Divorce Lawyer in Versailles -  Fast-Track Divorce Tips -  Simple Adoption in Yvelines