Judgment of the Court (Grand Chamber) of 4 October 2024.#M.-A.A. v Direcţia de Evidenţă a Persoanelor Cluj and Others.#Reference for a preliminary ruling – Citizenship of the Union – Articles 20 and 21 TFEU – Articles 7 and 45 of the Charter of Fundamental Rights of the European Union – Right to move and reside freely within the territory of the Member States – Union citizen who has lawfully acquired, during the exercise of that right and his residence in another Member State, a change of his first name and gender identity – Obligation on the part of that Member State to recognise and enter in the birth certificate that change of first name and gender identity – National legislation which does not permit such recognition and entry, obliging the party concerned to bring new judicial proceedings for a change of gender identity in the Member State of origin – Effect of the withdrawal of the United Kingdom of Great Britain and Northern Ireland from the European Union.#Case C-4/23.