I rarely, if ever, see people use parts of their real name in their username. In my case, I took "JUS" from me first name and "EY" from me last name. 1 Standing for the # of users I've created on a site. 1 for the 1st account made. 2 for the 2nd account made and so on.
These are ones I like the most due to they are original. Some people will actually use a name from some sort of book, or other things, as their username. Like this one guy in the Skyrim section. His username is something like "DearCicero" which basicly came from Cicero in Skyrim. Not very creative, if you ask me. (Not insulting anyone)