Our name theme actually started with Ares, our third betta. He was such a flare happy fish he constantly seemed like he was ready for war. Plus he was red and blue, so he became named Ares.
Apollo became renamed after the god of the sun (he's orange and blue and a sweetheart).
Lir was named after the celtic god of the sea, (he is a turquoise with dark blue and red, and is temperamental!).
Osiris is solid white, and was named after...yep, the Egyptian god of resurrection (or the dead and the afterlife). Mostly because he is so white he reminds me of a ghost.
And then there is Loki. He is the Norse trickster god. He was solid grey when we brought him home, and then as he got better, he turned red/blue and purple. Plus, Tom Hiddleston (who plays Loki in the Marvel movies) is GORGEOUS as Loki!
We also have the snails that are Hermes (Greek messenger god) because I thought that was humorous, and Pan, who is not a god at all, but he's gold and green and as he stars in A Midsummers Night Dream, the colors remind me of the moon, and grass, so a Midsummers Night.