Since my ships are combat escorts, I figured they should have more "combative" names. Call me biased, but the names Eris, Ceres and Phobos don't exactly convey the right feeling. Deimos sounds okay, but at the moment I am kinda fond of the name Hyperion and wish I could reuse it...
Eris was the goddess of strife and discord. Phobos was the god of horror. Fantastic names for warships.
Deimos is the best, though; the god of the terror specifically of war.