Re: "Cul - de sac" - French, read on....
Hey, that's a Catalan set phrase, too! And yes, it means "bottom of the sack" and it's used for roads with no exit because, as in the bottom of a sack, you can't go anywhere from a road with no exit, right? Does it make sense?
It's also used to express the end of an action, and other things that I can't think of right now...
I think it's a kinda funny expression... but as a surname? It must be hard to "wear"!!!
Eva