"jeroknite" is a username I came up with when I was a child. My first name is Jeron, and when I first booted up Dragon Warrior Monsters (that's what it says on the cart don't bully me), I had to shorten my name to 4 characters (jero). Eventually I started playing online games where account and character names had to be unique, and "jero" is usually always taken. I don't remember exactly why I tacked "knite" specifically onto the end, but it's what I went with.
It's not particularly clever or meaningful, but it's me