[Halbereth Diagona]

Ok, you probably won't believe this but I made up my nickname. Totally made up. I just typed it on the spur of the moment. I linked it to my own made up language, could be faery.
Halbereth: Well, Halber kind of sounds like Herald, which is an announcer. Eth is like a link, like and, so herald and
Diagona: Diagonal, simply because I am awkward, like diagonal things. I like to be the first to know things so my reasoning is Halbereth Diagona = Awkward Herald. That's my reasoning. Weird, but kind of logical when you think about it.
Then again, I put it into the name generator, and came out with Awful Brandybuck, which since I'm so like Merry is me to a tee!!