Name change are needed because of Fantasia Potion allow you to change Race and Gender. Either don't have this in the Fantasia Potion or have a name change come with it. Does not make any sense. Seeing how limited they are giving out Fantasia Potion and so rared, I don't think it would be that big of a deal to change your name.

Probably just do it so you can only change every one or 3 Months to prevent abused of continuing changing your name.