Mine is an old one for me, too. It stems back from when I was going through my divorce. I was having trouble getting over being alone in the evenings, so I would pop a Star Wars video in the VCR (yes, it was that long ago) and keep it going in the background during the evening. Eventually I fell in love with Luke Skywalker, which is ironic, because Han Solo is more my type. I think it might have been because I met Mark Hamill at the time that Star Wars came out; I was friends with his little brother Patrick. So I knew some of the tragedy that beset Mark between the first and second movies. (He got in a horrible accident that scarred his face terribly towards the beginning of filming the second movie. That's why he looks so different between the first and second movies, yet in some scenes of the second movie his face is still unscarred. He had plastic surgery to fix it, but the redness of his face in the Hoth scene was NOT makeup. It was the result of the surgery as it was healing.)
When I wanted to create an ID when I first entered the internet, I tried out a couple of different things. This ID I created when I entered the DBZ fandom and became a fanfic writer, and I've had it for a very long time. I can almost guarantee that if you see a Mia Skywalker somewhere it is most likely me, but it also might not be. I stopped using it for new forums because it was too well known. (I was a popular fanfic writer for a while, which never really made me comfortable.) As you know, I use a different ID for DC, and a different ID from both of those when I do Sims stuff. (I make mods for Sims 3.) I use even a different (male) name when I post on tech forums, because I've found that a lot of programmers and computer techs are extremely rude to you if they think you're a woman. (They think you're a moron for some reason.) My Facebook ID - which I NEVER use - is male also.
Mia is my real name, and Skywalker is the only last name anyone online will ever learn of me. I am absolutely paranoid about anything of my real self ever getting known online, which is why, if you knew my real name and tried to Google it, you would not find anything about me online.