MK tha Rebel is a combination of two names. MK Murder is the name I use on almost everything, but at first was the name of my created wrestler in every wrestling game I've ever played. I wanted a name that when with the character, who was a large, brutal, monstrous wrestler. Originally, it was Mike Murder, but I wanted something more original. So I removed the I and the E. The name just stuck.
Rebel is how I describe myself, and eventually I used "Tha Rebel" as a player nickname. Once again, it was a wrestling game. Spelled with an "A" because why not.
I decided to stop using MK Murder as a screen name because I wanted a name that was cool, but also a little more PG than Murder, so, there you go. MK tha Rebel.