It depends on how you define 'require'. If you mean 'require' as in "I don't need one because Im only interested in level grinding and end-game content with no interest in the story or scope of Eorzea" then no you don't need one.
As I said earlier though, I wouldn't see any harm in having it so you didn't need a surname when creating a character.
You do realise of course that if this change were implimented, you'd have to re-roll all over again :P
