"God MC,
me J-Hova."
Ever listen to Jay-Z? I like the guy's music quite a lot actually. He's an egomaniac though and has about 50 nicknames for himself.
"Who in your circle fan f*** around with Jay?"
Nas is another.
"Na- Nasty Nas"
Fat Joe: "Joey don't know, never seen never heard sh!t"
Biggie: "Biggie"
So, yeah, in rap it's something you're going to see a lot of.
One (and the only) example I can think of with Rock is a band called T-Rex (have you heard of them? quite good really.) Leader singer, Bolan, Marc. He says something "Bolan's gonna rock you now, rock ya now, rock ya now. Bolans gonna rock you now....etc.
Also, Mc Hammer, Vanilla Ice.
Eminem, Slim Shady, Marshal Mathers (my name's marshall mathers, I'm an alcoholic, i have a disease and they don't know what to call it...better hide your wallet..."