What's the name of One Piece's principal character? In the Brazilian subtitle, he was first called as Ruffy, but in the half of Enies Lobby/Water 7 Saga he started being called as Luffy, so I'm interested in knowing what is his name.
His name is Luffy.  You better know his name when he becomes King of the Pirates!

We have discussed the difference with regard to pronounciation on this site before.