This note, from 1218, refers to Rabbi Josce (Josce Presbyter), who shared a name with his grandfather, known in English records as Rubigotsce. Joseph Jacobs identified the grandfather as Rabbi Joseph Bechor Shor (!). I think that's much too speculative, but I mention it as a curiosity. That said, this family was definitely French, and they even maintained ownership of a house in Roeun, where the family originated.
Another recurring name in the sources is "Josce fil Copin," (Joseph ben Jacob, Yoshke ben Koppel if for some reason we're trying to make it sound more Yiddish).
Note that this Josce Presbyter's son-in-law is also named Josce. Guess they hadn't heard of the tzavaah of R. Yehuda Hachassid. Yes, I'm kidding.
Also note that one of the attourneys is called Abraham ben Muriel.
 For his reasoning see his The Jews of Angevin England pg. 409-411.
 His ethical will, which prohibits marrying a person sharing a name with your parent; he died in 1217. #26.