It takes most of a year for Marius to learn Cosette’s name. Once while they’re stealing glances at each other in the park, Valjean drops his handkerchief by accident. It’s embroidered U.F. for Ultime Fauchelevent (his current alias). Marius finds it, believes it’s hers, and decides her name must be Ursula. Later, when he learns that her father’s name starts with a U, he’s despondent, because the one thing he thought he knew about her has been taken away from him.
Since identity is the one thing that Hugo seems to keep limited to POV, for hundreds of pages they’re referred to by Courfeyrac’s nicknames for the duo: Monsieur Leblanc (because of his hair) and Mademoisele Lanoire (because she usually wears black, or did when she was younger).
On Tumblr (Re-Reading Les Mis)