Now that you mention it, I think I do remember Sora mentioning something like that about his and Roxas' names.

[Something about it being 'Sora' scrambled with an X or something.]

So, Isa. Why are you going back to your real name? Find a change of heart?

[She's trying to carefully lead the conversation to the topic of whether or not he'd be causing any trouble for her and her friends, while still trying to be at least a little polite.]