Can I give my child any first name I want in Luxembourg?
Yes, with great freedom — but not an absolute right to choose anything. The birth must be declared within 10 days to the registrar of the commune where it took place, and that is when parents fix the first name(s) and the surname. The freedom over first names is real, including for rare or foreign names, but the registrar may refuse a name that harms the child's interest or the rights of others: a ridiculous, insulting or purely surname-like first name. In case of doubt, the registrar refers the matter to the State Prosecutor, who decides. On the surname, the reform allows giving one parent's name or the two names joined, in the chosen order, one name per parent. The myth: "you can name your child whatever you like" — false: refusals are exceptional in Luxembourg, but the law protects the child against a name that would burden them for life, and "the child must bear the father's surname" is just as false.
📋 The rules
- 10-day deadline: every birth is declared within 10 days to the registrar of the commune of birth, with first name(s) and surname fixed at that point.
- Framed freedom over first names: parents choose freely, but the registrar cannot record a first name that harms the child's interest or the rights of others.
- Prosecutor arbitrates: in case of doubt over a first name, the registrar refers the matter to the State Prosecutor, who decides whether it may be borne.
- Choice of surname: one parent's name, or the two joined without a hyphen, one name per parent, in the order the parents choose.
- Sibling consistency: the surname chosen for the first child applies to all the couple's later children.
🔓 Exceptions
- Parents' disagreement: failing agreement on the surname, the child bears the father's first surname and the mother's first surname joined, in an order set by drawing lots by the registrar.
- Child born out of wedlock: a recognised child in principle bears the name of the parent who recognised them first, unless a joint declaration changes that choice.
- Several first names: giving several first names is allowed, but each is subject to the same review of the child's interest by the registrar.
⚠️ Penalties & fines
Here the risk is not a fine but a blockage and lasting consequences for the child. If the registrar considers that a first name harms the child's interest, they refuse to record it and refer the matter to the State Prosecutor; the birth certificate may then be drawn up with a different first name, decided by the court if the parents dig in. A ridiculous or insulting name allowed through exposes the child to mockery and may force them, as an adult, to start a demanding name-change procedure. On the surname, an unresolved disagreement ends in a draw of lots beyond the parents' control. Failing to declare the birth within 10 days disrupts registration in the national register, family benefits and social-security affiliation, and forces corrective steps. The best reflex is to check the intended name with the commune before the declaration.
📎 Official sources
- Guichet.lu · choosing the child's first name and surname (State portal) →
- Legilux · Civil Code, provisions on civil status and the name (official journal) →
- Guichet.lu · declaring the birth of a newborn →
❓ Frequently asked
Can the registrar really refuse a first name?
Yes, the registrar can refuse to record a first name that harms the child's interest or the rights of others, such as a ridiculous, insulting or purely surname-like name. In case of doubt they refer the matter to the State Prosecutor, even though, in practice, refusals remain exceptional in Luxembourg.
How many first names can I give my child?
The law sets no precise cap and it is common to give a child several first names. Each name still remains subject to the same review of the child's interest, and the registrar can set aside any one that would cause a problem.
Must my child bear the father's surname?
No, that idea is outdated: parents may give one parent's name or the two names joined, in the order they choose. The father's name alone is in no way automatic, and the surname chosen for the first child then applies to the whole sibling group.
What happens if the parents disagree on the surname?
Failing agreement, the child bears the father's first surname and the mother's first surname joined, in an order decided by drawing lots by the registrar. That draw takes place in the presence of the person declaring the birth, and its result then binds the parents.
Can the child's first name be changed later?
A first-name change remains possible later, but it goes through a separate procedure before the Minister of Justice, longer and more demanding than the initial choice. It is therefore better to check the intended name with the commune before the birth declaration.
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