My as well...It's sort of complicated thou...
Mine came from an anime called Pilot Candidate. A Zenoah (Zeno-ah) was the description of a perfect human. I dont think Im perfect, mind you, the name came up when I got AIM. I needed a SN and I wanted one to go with the anime and had to do with my fave chara, Zero.
A lot were taken, until I came up with Zenoah Zero (since he was a zenoah) so when I joined forums, I was Zenoah Zero. Then it got too long so I downgraded to Zenoah. Thou I pronounce it Zen-noah.