I used to use my real first name on every forum i joined. Its kinda unique and was easy to get as a user name.
This is going to sound crazy,,, but I started to get unwanted PM's from my girlfriend in High School, I've been married for 26 years to my wife at this point. I guess she googled my name and found me. It got creepy.
Switched my name to Vipon cause thats what my old motorcycle buddies used to call me. When I had to many adult beverages they would say I had the speed of a viper and the strength of a python. Been known as Vipon every since to those guys.
Truth be told,,,, they were probably just slow 8)