Would I have to change my name?

[Douten]

I was going to say that, but I did a lodestone search for "Kanade Tachibana" and it actually turned up a surprising number of hits, despite me not knowing where that name comes from.

Seems like it's a character from an anime, no surprise people will have it.
Unfortunately when it comes to server merge I don't think there's really any 'fair' way to solve this beside having to rename. At least if you have to and being able to redo your character with 2.0 it's like a free ride to re-create your character if you want to :>