Catechism of the Catholic Church §1025 — excerpt
To live in heaven is "to be with Christ." the elect live "in Christ," but they retain, or rather find, their true identity, their own name.
This translation is under copyright, so only the cited words are quoted here. Follow the link for the full text. Translation: English translation of the Catechism of the Catholic Church, 2nd ed. (Libreria Editrice Vaticana), as posted at vatican.va.
Also cites: St. Ambrose, In Luc., 10, 121: PL 15, 1834A