Article 370-1-7 of the French Civil Code
Simple adoption confers the adopter’s name on the adopted person by adding it to the latter’s name. However, if the adopted person is over thirteen years of age, he or she must consent to this addition. Where the adopted person and the adopter, or one of them, bear a double surname, the name conferred on the adopted person results from the addition of the adopter’s name to his or her…