The name should be original to you in some way to identify you, and should have some kind of meaning. So what city do you live in? Whats your interests? Whats your real name? What kind of reputation to you have? etc
Then from that information make yourself a name, or just forget about it and a name will pop into your head sooner or later ... a friend of mine was casually going toilet when the name 'MC ShitStain' came into his mind and he's been making moves around these parts.