Since when? He was Mel, then Feanor got mad and came up with an insulting name for him. He was still Mel. I am wondering at what point Mel decided to go with it. "Random scout, what's with all of these pathetic elves mad at some guy named Morgoth? Argh! Haven't I given them enough to whine about? Who's trying to upstage me?" After cringing ---> "Ah, Your Awesomeness, I think they've given you a nickname." After musing ---> "Hmmm...Melkor...Morgoth...Hm! Yes, Morgoth does sound scarier! I'll need new business cards!"