Do as the title says. If you don't understand that, then...well, I'd just have a pull a Leonidas + big pit thing on you.

Rastaban: Rastaban is a star, Beta Draconis; the third brightest star in the Draco constellation. I found this while doing work for astronomy class (btw, stars have some really cool names). I thought it sounded cool, and a lot of it fit me well: Draco because dragons pwnzrz, Beta because I make a better second- or third-in-command than absolute leader (plus, Alpha Daconis is Thubin, and that just sounds stupid). Rastaban is derived from the Arabic for "Head of the serpent." I don't care too much for the translation, but I love the Arabic and Persian languages.

Lord Grac: Grac was the main character of a book I was writing in seventh grade. It was crap. I decided to use that and add the prefix "Lord" when I joined my first MMO, Runescape, in October of the same year, because Lord sounded more medieval. It's stuck since.

Raeshii, Tizar Waveswrath, Vandar, Karn Fireyes: All made up. I rarely use these.

Azariah: I have yet to actually use this one, but I will. Azariah was one of three companions of the biblical character Daniel, who prophesied about the end of the world (all recorded in the book of Daniel, which is essentially the Old Testament Revelation). The name just sounds really cool to me.