As the others have voiced, it isn't fair to deny a native their own name.
How would you like it if you were still on Initialized, and some other forum's chatroom moved over and one of the members who also used "Sephiroth" as a screenname demanded you give up your name on the server to avoid confusion? Think about it.
Quoted for agreement.
Also, it might be your username here, but we're talking about the name of a popular Final Fantasy character, it's no surprise at all that it was already taken when we got to NorthFire, even if NorthFire is a small server. You'll just have to make do, because like half of the other people in this topic are saying, it's rude for any of us—the new arrivals to the server—to make demands of any sort when they've been nice enough to let us move the channel there.