Interesting, I didn't remember that Josette was given a different surname before either Collins or DuPres. Since I've been researching French names in my own ancestry recently, I looked up LafreniĬre, and it might best be translated as "Ashwood." A rather pretty yet melancholy name, at least with the English connotation of "ash."
The only other French surname I recall being mentioned on the show is Cordier, which means a rope maker. The name is most usually found in the north and NE of France, where my own ancestors lived. (I found the record of a sale made by one of my great grandmothers in the early 1600s of a hemp field - hemp being the source of rope, of course.)
Also, in the area where my ancestors lived, the surname COLLIN is found. The name is a diminutive of the first name "Nicolas," which was one of the most frequent men's names used in this region. Collins is the English equivalent, but I haven't looked into the etymology of English surnames so I don't know if there is a connection between the French name COLLIN and the English name Collins.
-Vlad