Well, see, normally what I'd do is change one letter of my actual name and use that. But not only do I use that name elsewhere on a comedy forum for disgusting basement-dwellers with no sense of taste, humor, or boundaries, but it also ended up being some random Japanese, half of which ended up meaning "star" and the other half meaning "to smelt" or "refine". I don't understand moonrunes, and I wanted to hide the potential of being thought of as a complete weeb. (i only like a few things like that, and its also possible to enjoy something without being creepy, k?)
I used a particular name in a text-based, multiplayer game called HellMOO; a very violent, post-apocalyptic RPG where nuclear fallout is the least of everyone's worries, it's the conniving, back-stabbing mutants that'll kill you for reals. So in that game, I envisioned a complete monster of a human-being, a dark-haired woman with pointed fingernails, effective mutations, a powerful build, a cold stare, and highly-detailed descriptions of skull tattoos with snakes slithering from the eyesockets-level of pure evil. I was a complete asshole; if you had something I wanted, I would track you, watch you, and examine your abilities and fighting style. If you got weak, or if I'd decided I was better or stronger than you, I'd just go all-in, kill you, take your item(s), and then pee on your corpse. Then I'd pick up your corpse, drag it to your home, or if I found you, drop your peed-on corpse at your feet, and then pee on your cloned-newself. I carried plenty of drinks with me specifically for this purpose. It was like my trademark, or something. I was feared by newbies, intermediate players, and rival corporations as an extremely dangerous person. I could frequently down players tougher than me, but less through brute-force, and more through playing smart. I fought dirty, using poison, odd-damage types that were difficult to resist using normal equipment, explosives, or some of the very nasty effects some of my mutation-powers allowed me to perform to soften up, or heavily debuff them prior to engaging or during the fight. I rolled with the biggest and best corporation (that game's version of a guild), so I never really had enemies; only prey, and was incredibly hooked-up with the biggest and best gear I could feasibly use.
Her name was Nyan. This is also where I'd discovered that nyancat was a thing, but the name's true origin in my head was from a dream in which my sister had a friend named Nyan somehow. The sound a cat makes in Japan. None of my dreams ever make any sense. I decided I really liked that as name, so I used it there.
Due to the popularity of the nyancat thing, my completely original and totally not-stolen name because less easy to use in the sea of nyanposters, so I just slapped 'star' on the end because the aforementioned half-of-the-other name, because I like awesome space-stuff, have studied and failed out space-related courses, and also because it makes me feel cool.