état civil – Utilisation du nom d'usage d'un tiers dans un acte d'état civil

This written question concerns the rules and practices surrounding the use of a third party's name, known as a 'nom d'usage', within official civil status documents in France. It seeks clarification on the legal basis and conditions for such usage. The question affects individuals who wish to use a name other than their legal surname on official documents, and the civil status officers responsible for registering these records.