How did you come up with your username?

Pokemon usernames in every game and forum since forever. Jirachi was in the newest movie at the time. Everywhere I can I stick to Meowth, Steam is the only exception where I use Macho Man since I can play OH YEAH! sound clips on TF2.

Shardok was pulled out of thin air when I was looking for an Elven-ish sounding name in a roleplay that would also not be too clearly Elven.

My last name which I use in place of Shardok on the rare occasion it is taken, GraBug, comes from stealing the Orc naming pattern from The Elder Scrolls and adding Bug for the second part. Although that should really be GroBug apparently as I found out later Gra and Gro show female and male...

Remember when Sun Micro made ugly, huge CRT monitors? Remember the day the original Everquest came out? The name I had been staring at for months had already been taken, so I settled. Somebody else clearly shared my lack of creativity.

a mix between Invader Zim and Space Invaders

Because of these guys. Played MechWarrior relentlessly when I was younger and just utterly adored the Jade Falcons. Years later, when I was choosing a new e-mail address/worldwide username (my old one had been compromised), I thought of Clan Jade Falcon and knew what I had to choose. Problem was, I figured they were the good guys, but about a year ago, I found out they were the antagonists. I'm okay with this.

ETD is short for Elect The Dead, one of my favourite albums of all time, by Serj Tankian, the singer of System Of A Down who i met personally after a show. really cool guy to talk to.

Macea is the village where I live.

-Back in 2007.

-Watching Spongebob while babysitting my cousin.

-New PS3 arrives.

-Go upstairs to set it up. Cousin keeps watching show.

-Start it up, get to the whole profile creation process.

-I hear shrieking from the T.V. downstairs, with one of the characters on the show yelling "MY LEG!"

-It flowed right onto my username.

-I now use it with every other gaming system/forums to this day.

My username originates from italian horror comic book Dylan Dog. Dylan Dog is a private investigator specialising in paranormal activities (or "nightmare investigator" as he usually calls himself), former alcoholic and ex cop. Dr Xabaras is his greatest nemesis and father, something along the lines of Sherlock Holmes/Dr Moriarty relationship. Its one of the greatest graphics novels ever created that raises deep philosophical questions about nature of man and absurdity of life. Sadly there's maybe one edition of Dylan Dog published in USA (by Dark Comics editorial) and whatever you do - avoid this movie. Its one of those Hollywood "let's make a movie based on comic or videogame that has nothing in common with original work" crap

Because my name is Jack and i love astronomy

nuttertools :3 (Grand Theft Auto: Vice City, yeah :p)

Xenomorph (I'm an alien fan)
Lair (i like caves, lairs)
XenoLair

I smashed my keyboard with the power of a thousand baby gorillas. And thus a legend was born.

There's this brand of T-shirt that I used to wear back in high school a lot: "Big Dogs". The school's annual Mr. Universe-eqsue competition for the senior guys was coming up, and some of my lady friends coerced me into signing up. I couldn't think of a name, so one suggested "Mr. Big Dog" because of the T-shirts I always wore, another suggested changing the O to an AW. So everyone started referring to me as "The Big Dawg" and the name just stuck. Wherever some form of "TheBigDawg" is already taken (the bastards) I add J to the end because of my name, Josh. And that's the story of my screen name.

TL;DR: Username based off of t-shirt brand I wore a lot.

I have no idea, yet I like it.
This is the first time I`ve realised I have no idea of how this name came out, and I have been using it for quiet a few years already.

I was really bad at naming my characters in RPGs, and could never come up with good names. While I was playing Warcraft III, I noticed the sword named Frostmourne, and thought that maybe I could change it to fit as a character's name. I got a character name, took the surname as my username, and I've been using it ever since.
Unlike most people think, The Bourne Supremacy was not an inspiration source.

(As a side story, my previous username - MANY years ago - was Megatron, which was inspired from the main rival in the game Electronic Popple. Only later I've learned that it was actually the name of the main antagonist in Transformers.)

Trolled omegle.

A few years back I wanted to create a rogue-like fox character.

Since I'm not too good at naming characters, I called him shadow.

Then later I thought that shadow is a dumb name for a character.

I renamed him Tzell, which means 'shadow' in hebrew, to make it sounds better and mysterious..ish :P

I got mine from a table top RPG called Shadowrun Technomancer - someone who can access the Matrix hack and control electronics/robots/cars using only there mind.

Because of pure things and the fact that I like dogs and the movie Bolt :-)

mine is a variation of the latin word cadere(edit: caedere), which means to kill, my name, caedo, means "I kill" as I mostly play shooters

I wanted a name which needs education to understand and be different from others

the leetspeak is because I want people to understand the name only with a second view

it's my name

The movie "The Warriors" lol

Unfortunately, my username is too long for most systems to accept, but I use variations of it wherever I go. It is: Incognito Mosquito. Was BSing with my friends and we were saying strange things and I came up with Incognito Mosquito because it sounded funny. Fast forward 5-7 years, and I finally got sick of using "Scorpion" as my username and spend a day trying to think of something interesting. For whatever reason Incognito Mosquito came back to me, probably because the previous discussion took place in a gaming store while watching people play Unreal Tournament. It is now my username of choice. I found out 4 years later that it is also the name of a childrens book series, as well as a band name. Which unfortunately means I can't get the gmail address i want :-\