Mica, thank you for some of the details of your name.
I'll start. My name is Jonathan Alan Levine and I'm a physician. Nothing too original here.
Jonathan, I have to admit, every time I see your username I read it as "javelin mind"!
As for myself, my "real" name is Harry Pearlton Bridge III. I was never happy with my name - "Harry" was old fashioned and sounded like "hairy" and I had never (and still have never) heard anyone with the name "Pearlton" besides my dad. I got really into the Beatles in 7th grade when we moved to Japan and I wished the P in "Harry P. Bridge" could stand for Paul.
It wasn't until after I turned 30 that I had a flash that "Harry" could be short for Hieronymus, as in Hieronymus Bosch, so I adopted it as part of my musical identity, except I misspelled it with an extra "o" - hieronymous - and I've stuck with it ever since 2002.