I don't have a fondness for the name Darrell. Or at least I did not. Rather, I knew several bullies with that name, and when I was writing the novel that shattered haven is based on I decided to name te main character that in order to help me overcome my own preconceptions about the name. That's the only real time I've used the name in a story, is this book and the game based on it.
You're probably thinking of the character art in avww by the same name, of course. That was simply reusing this character; and in facts number of the sprite names from avww are simply reuses o character names from my writings. But as none of those other writings have a name attached, that wasn't obvious.
Incidentally, x-4000 was actually the name of a villain from a (pretty bad) novel I was working on in high school. When searching for a name for things outside of stories, I tend to use names from my writings because I spent so much time coming up with them. I'm particular with names, so having a stable of them helps.