Yes, I would change it...and right away. I chose this name because I had it on a few other sites ever since I was 12, but it's always the same thing.
"Hey veg, your post was OVER 9000!"
"Vegeta, you have OVER 9000 posts!"
"Vegeta, I've told you already about (fill in the blank) OVER 9000 times!"
"Veg, your joke was OVER 9000 times funnier than mine!"
"Vegeta, your skillz in hacking are OVER 9000."
OK I get it, just please stop saying the joke! :P
If I could change my username, I'd change it to either "The Truth", "Gold Member", maybe "The Dude", or possibly "The Boulder"