A bit of history to mine, but when I was younger, I needed an upgrade from my username of "Wizboy" that I had donned during my childhood on the web, so me and a still longtime friend of mine decided to use a Klingon Random Name Generator to replace it.
We cycled through many names, but eventually, landed on "Kunivas", a name I've recently found out belonged to a dead Klingon in Next Generation, how unfortunate. lol But I liked the name and it has stuck since, seeing use in my other name adaptations, i.e SuperiorKunivas, intended as a combination of Xemnas's title and my name, but it gave an air of superiority and arrogance to me, which I became uncomfortable with, so most if not all of my usernames are now "Nero Kunivas", my Gaming Moniker of many years prior.
Nero came from both the usage in a couple of friends names and my liking of Nero from Devil May Cry 4. Now it's my go to name practically all the time and I cannot imagine using anything else really. Sometimes I have to forgo the spacing between them. .-.