Not accepting my name

[Qui-gon]

Hey guys, I'm having a problem with my name. I typed one in and a few weeks later when I logged in it says something like, "Then is an issue with your last name, please rename your character."
The thing is, one name doesn't even has a last name and the other (yes, this is happening on two guys) has an - in the name (Qui-gon...) so that might be part of the problem. One of my questions is, does it have to have a last name? For an example "Qui-gon the Great" or "Qui-gon Jinn".
I don't want to take the risk of choosing a different one, and then have them accept it. Things might change when it officially opens, what do you guys think?

~Q/S