My real name is Ryan, and Ive always been a pretty big guy (I was about 5 feet tall in kindergarten) and because of that I got the nickname Ryno. Big like a rhino, but spelt similar to Ryan, yeah you got it.
Anyways eventually I needed to make a username for stuff and I begun brainstorming, and then "Killer Ryno" popped up in my head, I liked the sound of it, and it just stuck.
Ive at times wondered if I should make a new name but everyone tells me they like Killer Ryno.