When it comes to your baby’s surname in France, parents have a choice: the father’s name, the mother’s name, or both names joined together in the order they decide. This choice is made through a joint declaration handed in at the town hall when the birth is registered. Without a declaration, the law decides for them, and the choice made for the first child applies to any children who follow.
The decision looks simple, but it binds all future siblings and can only be made once. This article sets out the rules from the official Service-Public.fr (the French government’s public services website) information sheet, checked on 6 August 2026, and suggests a way to talk it through calmly before the birth.
Which surname can you choose for your baby?
For a couple’s first child together, Service-Public.fr lists four options:
- the father’s name;
- the mother’s name;
- both names joined together, in the order chosen by the parents;
- just one part of one parent’s double-barrelled name.
One limit applies when a parent already has two names: each parent can only pass on one surname. So the child will never end up with four names. There is one exception: a compound name dating from before 2005 cannot be split and is passed on in full.
How do you declare your choice of name?
The joint declaration of choice of name (‘déclaration conjointe de choix de nom’)
The choice is made official on form cerfa no. 15286. Both parents sign it on the same date, and the form is then handed to the registrar when the birth is registered. There is nothing to stop you filling it in during pregnancy, once you have made your decision.
The chosen name is only entered on the birth certificate if parentage is legally established for both parents. For unmarried parents, this in practice means the father must formally acknowledge the child, either before the birth or when it is registered.
One more task for the calendar of those first days
The birth must be registered within 5 days of delivery, at the town hall where the baby was born. The declaration of choice of name is one of the documents to bring, along with the acknowledgement certificate if it was drawn up before the birth. Our article on paperwork after the birth sets out the order of all the formalities.
The easiest thing is to keep the signed form with your ID documents, in the document wallet of your hospital bag. That way, whichever parent registers the birth won’t have to hunt for anything.
For a child born abroad
If the birth was registered with the local authorities, the declaration of choice of name can be submitted with the request to transcribe the certificate into the French civil register. It must be made no later than 3 years after the birth.
What happens without a declaration of choice of name?
Without a declaration, the rule depends on the parents’ situation:
- married parents: the child takes the father’s name;
- unmarried parents: the child takes the name of the parent who acknowledged them first;
- simultaneous acknowledgement by both unmarried parents: the child takes the father’s name.
So declaring nothing amounts to choosing the father’s name in most situations. That’s fine if it’s what you want. But it shouldn’t happen by accident.
What if the parents don’t agree?
The law provides for disagreement. One parent notifies the registrar in writing, no later than the day the birth is registered. The child then receives a double surname, made up of both parents’ names joined in alphabetical order.
This rule stops one parent from imposing their name by default. But it also takes the order of the names out of the parents’ hands. So it’s better to settle it together before the birth than to let the alphabet decide.
The choice applies to brothers and sisters
This is the point many parents discover too late. When both parents appear on the first child’s birth certificate, the name chosen for that child automatically applies to the couple’s later children. Making no choice also counts as a choice for the future.
Service-Public.fr sums it up like this: “The choice of a child’s name can only be exercised once.” Two children of the same parents therefore share the same surname. If you are expecting a second baby, our article on preparing your eldest for the arrival of a second child covers the rest of the transition.
Can you change your baby’s surname after the declaration?
Not freely. The choice is made once and for all, except in one specific situation set out by Service-Public.fr. If the father acknowledges the child after the birth has been registered, the parents can change the child’s name through a joint declaration before the registrar.
- Under the age of 13, the parents’ joint declaration is enough.
- From the age of 13, the child must also give their consent.
- The change is noted in the margin of the birth certificate and applies to the couple’s later children.
The ‘nom d’usage’ (name of use), which lets someone go by a different name in everyday life without changing their civil status, is governed by separate rules. Service-Public.fr has a dedicated information sheet on it: check it before taking any steps.
Situations that follow other rules
The official information sheet points out that the rules are different for female couples and in cases of adoption. In these situations, go straight to Service-Public.fr or ask the civil registry office at your town hall.
How to talk it through together before the birth
A surname touches on each person’s own history, and the conversation can be more emotional than you might expect. A few pointers can help keep it calm:
- Talk about it early, at the same time as first names, rather than on the maternity ward.
- Say what the name means to you: a family, a region, a heritage, or perhaps nothing in particular.
- Think about everyday use: a long double-barrelled name has to be written on every form, at school and in every official office.
- Think about siblings: the choice will apply to all of the couple’s children.
- Think about life’s changes: a separation does not, on its own, change the name recorded on the child’s civil status.
On that last point, organising shared care between two homes is covered in our article on shared custody with a baby.
The first name is chosen separately, and it’s the one your baby will learn to recognise first. Our guide to the age at which babies respond to their name shows how that word becomes theirs over the months.
Key points to remember
Your baby’s surname can be the father’s, the mother’s, or both joined together in the order you choose, with only one name passed on by each parent. The choice is made by joint declaration, handed in when the birth is registered. Without a declaration, the child usually takes the father’s name. If a disagreement is notified, the child receives both names in alphabetical order. The choice is made only once and applies to brothers and sisters.
Sources
- Service-Public.fr, “Choix du nom de famille d'un enfant par son père et sa mère”, information sheet F10505, checked on 6 August 2026.
- Service-Public.fr, “Déclaration de naissance”, information sheet F961, checked on 18 June 2026.
