I guess you shouldn't wonder why certain music artists use pseudonyms... they have really dorky real names. canadadrugcenter.com
I have found that mug shots can be quite revealing of many things, including their real names.
Most of us know Eminem is Marshall Mathers, but what about Brian Hugh Warner, Robert James Ritchie, and of course, Robert Van Winkle?
I guess no one ever names their kid thinking they'd someday be famous and have their name plastered all over an exposé website... ;)