It's a fake name I use to give out to random people when they randomly decided to ask my name (I was actually believed once). I stopped using it since graduating High School but I really did like the name combo so I used it when I decided to sign-up on here (plus, it's a hell of alot more original than most of my usernames on other sites). As a whole though, Mustafar comes from Star Wars and Reginald is just a name I really like (and I think the two go together well).