Article 311-24-2 of the French Civil Code
Any person of legal age may use one of the names provided for in the first and last paragraphs of article 311-21. With regard to minor children, this option is exercised by both parents exercising parental authority or by the parent exercising parental authority alone. In addition, a parent who has not passed on his or her surname may add it to the name of the minor child as a…