I invented mine. I was tired of having dumb usernames that someone else came up with and repurposing them for my own use, so I sat down and poured over a few name lists and came up with some good potentials. One of them was Phanax, which was neat, but missing something. So I took part of the name of the most awesome dinosaur ever and the name of a Norse god and stuck it on the front.
Hence Tyrphanax.
People say it sounds like a decongestant nasal spray. It does. Oh well.