I'd call him Cuprum, latin for copper, since he kind of looks a little coppery in this picture. I'm partial to latin names and names of stone, so if you want a list of latin names for colors, here's one:
http://www.coolschool.k12.or.us/cour...atincolor.html
I don't know if you would like such a "unique" name or not, but the link's there if you want to use it :)
*Edit* If you decide to name your fish one of these, I'd make a cute nickname to call him since I'm pretty sure calling him some complicated latin name evry time you see or write his name would be slightly tedious XD