Haha...I've had so many aliases over time...
Time-Machine is a nicknames my soon-would-be friends gave me at the beginning of my freshman year of high school. The story behind it is long, and really boring, but nowadays most people I know call me Time-Machine, even in real life (even my teachers and my parents o.0)
I sometimes went by Amaya no Uta or Utano Amaya or Amaya Uta on different places. Amaya means "nights rain" and Uta means "song" and any combiniation of those two things makes me smile. (if anyone was on Syaoron Bear's Corner a few years ago, that's what I went by, and I used to have a fanfiction.net account under "Utano_Amaya" though I'm not sure if it's still there)
When Time-Machine is taken (which isn't often) then I add "Lives" to the end, as is "Frodo Lives," because the first time I came across Time-Machine being taken I had just watched Lord of the Rings ^_^
Another name I've used once or twice is "Timoleon" which comes from Myth and has "Tim" in it, which is another name people started calling me when they didn't feel like saying "Time-Machine" because that's kind of long.
haha, no one ever calls me by my real name... I guess "Jessica" just doesn't suit me.