Ohhh : oo good question! It's a while since I came up with those names, but I'm pretty sure my search started with "latin and greek names for stars and constellations." Aethris is a play on a word that ties in with the north star (since the city is far north hehe). But I can't quite remember the background for the others, but are definitely latin or greek words that I have changed to sound more coherent with my story :)