If you link to your XI account, when its time to name your character, you should have the option to load a saved name. If you do that, it will allow you to pick your XI Name + Server Name. But no, you don't have to use that name.
Ok, now we're going to get slash fiction of Wint x Kachi somehere... rule 34 and all...
Never confuse your inference as the listener for an implication of the speaker.
Good games are subjective like good food is subjective. You're not going to seriously tell me that there's not a psychological basis for why pizza is great and lutefisk is revolting. The thing about subjectivity is that, as subjects go, humans actually have a great deal in common.