Name changes don't affect blacklist or friendlist, people remain in those lists. All the naysayers to name changes are also forgetting that with the use of Fantasia, people change races and/or genders making their names just not match anymore.

On another note, I wonder if people realize that while you see plenty of Western players name themselves in JP-esque names, the same happens on the other side of the pond with JP players that name themselves in Western-esque names.