I find it ironic that Seraphim is used for one of the Shivan bombers.
Here, we're mostly talking about evil names for evil, Shivan things, but the word "seraphim" actually refers to the highest order of angels in Christian angelic hierarchy. The same sort of thing applies for Lucifer as well (the word has obviously shifted from its original meaning, "light-bearer," and thus makes sense as a Shivan term).
About names, I think Norse mythology is a good source for all sorts, good and evil. The FF series actually borrows very heavily from this area; FFVII does the most. We talked about it briefly (vikings), and FS does have a couple, Loki as mentioned and Mjolnir.
Baldr, Delling (sounds Terran), Aegir, Skuld, Aurvandil, Kvasir...
And we haven't even gotten to the more popular ones like Odin, Thor, Fenrir, etc.