The Civil status law specifies how the registration of a newborn is carried out. With that in mind, there is a rule that explains this The last name could be determined by drawing lots and not by parental decision.
At the time of birth, parents must agree on which surname their heir will take in order to have it registered in the Argentine system. However, you must always meet some requirements, which are listed below Law 26.413 via the civil status and civil status register.

Registry office: In this case, a child’s last name is entered
Within the scope of this regulation is the Government explains that a child may take the first name of either parent or the first name of both in the order they choose.
Despite it, It may happen that the parents do not agree about the last name chosen or the order in which they are listed. For this reason the registry office I could avoid defining this question.
Once this surname or order is established, the law requires that all children of the same marriage must bear the same surname established for the first child.
What names can be chosen for a child in the registry office?
There are some Prenouns that cannot be registered in the registry office, such as:
- Surnames as prenouns
- The first names are the same as those of the living siblings
- More than three names
- Extravagant names.
It should be noted that Aboriginal names or names derived from indigenous and Latin American indigenous voices may be registered. In addition, if they used a first name before registering, they can use it if it complies with legal requirements.
What happens to the last name of a child who is not from the marriage?
To define what last name a child has outside of marriage:
- If the child is only related to one parent, he or she has their last name.
- If you have a relationship with both parents, the same criteria apply as for children born in marriage.
- If the affiliation with one parent is later determined, the parents can agree on the order of the surnames.
- In the event of no agreement, the judge will decide the order of the surnames, taking into account the well-being of the minor.
Adopted children, in turn, may have the last name of the person who adopts them. If it is a couple, the same rules apply as for any biological child.
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