Mine is a combination of a nickname and letter scramble of my name. I use it for almost everything, and surprisingly most people put an extra S in my name when they retype it- RustSpot.
My name is Ross and every few years up to highschool my nickname would change. It was Rossty at one point, pronounced more like Ross-Tea than Rusty, so I spelled it RosT. The first three letters of my last name are Put, so RostPut was my first thought when making an internet handle years ago, but it didn't flow well, so I swapped the U and O and made Rustpot.
Thanks for sharing Ross :0)
PS your avatar pic with the gun it scary :0( its like you're looking right at me.