I got mine while trying to create a website.
I was looking for a free template to start off on and I found one called INVADER and was based on the classic 'Invaders' video game. Because I didn't want this as my site name I changed it by adding an X to the start which was brought on by the X parasite from 'Metroid: Fusion'.
I started to use it as my nickname as it was different than my usual name of GOLDENCHOCOBO and almost no one else has it...

To explain:

Vulgaris is a Latin term which means "common". It pops up often in the biological sciences.

Prime is a reference to the Transformers fans I make friends of, as a few TFs have the suffix of "Prime" in their names (obvious example: Optimus Prime).

When I was young, I had a white manx that loved sugar cubes...

From there, the name was born

P.S. My next cat after that was a balinese cat that was trained in the art of flushing toilets *lol* (Yes, I trained it). If I named myself after that cat, I probably would've been called "2000 flushes" or something

Mine is a mixture of my first and last initial and one of my all-time favorite gaming serieses, The Legend of Zelda.

I got mine from a book >_< I was reading it when trying to think up an e-mail name, and I liked it. I actually remembered it wrong, it's supposed to be Dominion not Domain. I think mine is better ^_^ Now I use it everywhere.

1. My email uses it...
2. Named after my Anime/Manga character Jago Mizukami.
Who was made from a combination of traits from DBZ, Sailormoon, Tenchimuyo!, and Inuyasha. He is Saiya-Jurai-jin.

I've used this name... for quite a while... since about 1999 or so... before I even joined Deviantart... His character changed appearance wise for a while before I settled on his present design... but basically that's where I came up with the name... "Jago" sounded cool to me, also the name of a character in Killer Instinct... while "Mizukami" just means "Water-Spirit" or "Water-God"... anyway that's the origin of my Deviantart name / my email.

I created it and used it everywhere

Mine came from the word "juggalo," which is a nickname for a diehard fan of the horror-core rap duo, Insane Clown Posse.

I may be a fan of their music, but I'm not as religiously dedicated as most juggalos, so the rest is history!

LONG time ago, in 3rd or 4th grade, I made up stories about a dragon named Endo. I came up with Endo when I found it in the word Nitendo when is was bored

Anyways, somewhere down the road I just put dragon with it and there you go.

mine was a mistake. lol XD; i hate my username.