Look, in the end, I think we all just need to go to the true authority on this subject: Clive Owen's "King Arthur". I mean, sure, Lancelot du Lac SOUNDS French, but isn't it more realistic that he was a captive Iranian who was reared by the Romans and ended up in Britain and then got a French-sounding name by accident? ;) Sounds like completely firm ground. And as we know, Hollywood always get's right, right? Like, why doesn't everybody understand that Edward III was actually Scottish like Mel Gibson's movie tells us?