I also think Seb's name should be pronounced the original way.
@ Kezzi: You can't even pronounce your own name with the correct french accent
I have a german/dutch name, so no trouble there. But then again, in English or French-speaking countries they can't seem to remember it because they don't know it
Of course original French people say it the best, but Dutch people should understand that the last 'e' is silent and don't take the 'a' as 'aaaaaaaaa' like they're in pain or something.