
You english thieves...
Arthur is the french hero derived from the town Harfleur. Harfleur is the base version of "Arthur Fleur", who the english poached as Arthur Fowler and made famous in the epic legend "the Enders of the East". Arthur Fleur is a cock-ney and as we all know the cock is the national symbol of France.
PS You also stole our most famous insult the raised two fingers, but we French do it better, we put both hands in the air! Ha, so there...