Illarion.org

I have tried to make a new character. I wanted to reuse an old name, bring back a character I used to have. When I enter the name I get this message ("Array" is not allowed in the name.) The name I was trying for does not have -Array- in it anywhere. I have used the name in the past so it must be acceptable. I then tried another name just to test it, got the same message.
Any idea's what I may doing wrong?

What names did you try?