The Armada forum has one of there topics (it's the only thing worth reading over there;) ). It was a great idea and makes for a very entertaining read.
Mine is rather boring. I couldn't think of a name, so I just took the name of a tie interceptor pilot. (I was later mocked on the x-wing forum for picking the worst pilot in the game! If I could go back, I would be The Sensei of the Squeegee, a nickname I had when I worked at an Italian restaurant in high school.
Mine is a mocking nickname given to me by a classmate in high school (one of those people who is constantly, bitterly sarcastic and smug) and my childhood address. It's been my screen-name since the internet began, as I had no experience in coming up with better screen-names and didn't expect it to be as 'permanent' as it has become.
Edited by tomkat364Mine is a character I played in Everquest 2. I made an Ogre and wanted a name that sounded like an Ogre. The home city of Ogres in that game was Oggok, so I just grunted for awhile until I came up with something that sounded appropriate. I've used it ever since virtually everywhere. Suck though because SOMETIMES i'll find someone has taken my username on a forum or something. Like some jerkwad took "Crabbok" on Snapchat and I'm like "You didn't grunt that name out.... I DID!"
Family Guy.
I got nickname Alpo (fennocized variant of Albert) for a presentation of Albert Einstein in highschool. When I needed a handle for our c64/vic20 demogroup (around 1989), Albert was a natural choice. Later in the university my IRC nick albert got stolen regularly, so I switched to al_bert, and later to a1bert, and that has stuck with me.
Edited by a1bertIt is my name from the Society for Creative Anachronism. I don't participate anymore but I keep the name.
I like Boba Fett, and my name in real life is Rick.
When the Original X-box went live some ten plus years ago I needed a screen name so I could download the KOTOR DLC, I had a G1 Omega Supreme from Transformers and some EpII Clone Troopers battling it out on a book shelf. I combined the two.
Edited by OmegacloneNickname in college bc I wear a lot of hoodies. Even when its like zero outside, no winter jacket for me, just a hoodie! And then my initials.
~D
I like Boba Fett, and my name in real life is Rick.
You're Joking!!! 
In high school, within the group I associated with, I was the only person in the group that would routinely go to school dances with a date. One of my friends began referring to me as "The Stag" in an ironic way, and that caught on within the group. Sometime after that I had to create a nickname for ICQ (or AOL, or both), so I used the_stag and have stuck with it ever since.
I like Boba Fett, and my name in real life is Rick.
Wait.... Real life? What's that?
I realized my normal username was already taken here (or I got it and forgot the password/email to it) so I created this one as a joke. The moment I saw this picture for it, I was sold.
Mine is the Finnish name of a type of mushroom. I can't remember exactly when I first came across it, but I just thought it was a funny sounding word, plus it has the words "wool" and "hair" in its name and I have a beard and dreadlocks, and I happened to need a username for something or other. It's silly, but somehow it stuck.
Great question. Around 1997 I was living in the London, stationed at the US Embassy. I had a team member that started referring to me as Rikalonius, being that I went by Rick. I loved it. It sounded Roman, and i'm big into the study of Roman history. So I started using it for my nom de guerre, and then on the internet.
Edited by RikaloniusShiba Majushi was my L5R character back in the day, and it's stuck with me ever since
well......my name is Jak, and this is a Star Wars forum.
also, 
I'd make an awesome Sithlord
from the original starcraft. the protoss always referred to you as "executor" in the campaign
just kind of stuck, i guess
Mine is the title of a song by Counting Crows that I have just stuck with across various forums for a long time. They got the title from a book called, "Henderson the Rain King" by Saul Bellow.
And I belong in the service of the queen
And I belong anywhere but in between
She's been crying and I've been thinking
And I am the rain king
Mine was inspired from the game Pandemic and it's Bio-terrorist. I liked the name, and changed it to BioHunter, more fitting for star wars, and added my favorite numbers. ( Try Pandemic. It is a great game. Also has anyone played Pandemic: Legacy? I am not sure if I want to get it or not.)
Mine is from...
About 10+ years ago I started playing Star Wars Miniatures, and I had to come up with a forum name. This has always been one of my favorite lines from Star Wars, so I was lucky that it was free. I've stuck with it ever since. My SWM friends now often refer to me as "tint" (the acronym of those 4 words).
D503 is the main character in a Russian 'steampunk' style novel by Evgeny Zamyatin called 'We'. It was written in the 1920s and then banned by Stalin, and used ideas that became staples of dystopian fiction, steampunk and science fiction much later in the West. Orwell claimed he had no idea about this book when he wrote 1984, but they are quite similar.
The ending of the book is brutally Russian, and it would make a great movie if Hollywood could ever tear itself away from making inane sequels for idiots.
Mine is pretty boring, I signed up to the forum when I was playing X-Wing and at the time the only thing I was playing was 4 Royal Guard Interceptors...
Softail comes from the type of motorcycle I ride, A HD Heritage Softail Classic. But saying that, it's been a great conversation starter on forums with people asking what a softail is.