How did Pisces get its name?
Pisces called Ichtyes ("the fishes") by the Greeks, "Pisces" being the Latin translation.
In the constellation of Pisces there's a big fish and a little fish. In Greek mythology Aphrodite and her son, Ichthus (some versions say the god Eros was her son), were being pursued by a huge monster fish by the name of Typhon.
In order to escape their nasty, monstrous pursuer, Aphrodite turns herself and her son into fishes. Together they then hid from the monster fish, Typhon, in the Euphrates River. Aphrodite (symbolizing in this case "the great mother") is the big fish and Ichthus is the small fish...