Mmn, well Seifer was originally Tiger Tooth, based off Tigerstar >.<. His name change to Seifer was just because I was playing a game and fought a character named that. I thought "oh, cool name!" And, thus, Tiger Tooth became Seifer.
Atrox is the last word in the scientific name for the western diamondback rattlesnake, crotalus atrox.
Sonne is the German word for sun. He is the bright, courageous one.
Asche is German for ashes. Tiny and frail, he is as delicate as an ash pile in his current pup state.