Antagonist name

Im currently writing a series involving the human race losing a huge war. This will all be in the first person perspective of a young boy who was drafted to fight. The Antagonist will also be a boy but unfortunately lost his sanity. I need help figuring out a good name the antagonist.

It would be nice to know what other names you’re using in your story just so I could get a feel for what you’re looking for, and so I don’t use names you’re already used.