Obviously, most end in -a. But then when I was thinking of various names from the Odyssey and the Iliad and all, I noticed that Eris doesn't have that. For a moment I wondered if it was due to her nature -- if there was a God of Discord, might he be named Sue? But then Artemis came to mind and blew that out of the water.
But! Then Paris came to mind, and he's a he! So is it that Paris has a rather swishy name, or do Eris and Artemis have rather 'butch' names, or is "-is" a gender non-specific suffix?