Article 1055-5 of the French Code of civil procedure
An application for a change of gender and, where applicable, forenames in civil status records, shall be brought: 1° Either before the court within whose jurisdiction the person concerned resides; >or 2° Or before the court within whose jurisdiction the birth certificate of the person concerned was drawn up or, in the case of a birth abroad, the court within whose jurisdiction the central civil status department of the Ministry…