Since I'm as bored as you, allow me to translate them. They're actually names from Norse mythology. I'll only translate those I'm sure of, as I'm not an expert by any means. Maybe Dragon could give us a hand if she's around?
Anyway:
Frey (hero)
Freyja/Freya IIRC (heroin)
Brunehilde
Odin
Isen
Thor
?? - Tyr
?? - Frigg
Heimdall
Sigmund
Helgi
Regin (I guess?)
?? - Volund
?? - Ran
Gunther/Gunthar (?)
Hagen (not sure)
?? - Alfhild
So yeah, the game is actually about Norse mythology. The two heroes are gods, and the people who are fighting the giants (who might as well be called titans, as their name is written with the kanji for "god") are humans. Some villagers actually say "maybe I'll go to Valhalla" during gameplay when they're attacked, or something like that.