An academic article (in Hebrew) discussing the identity of the Philistine god Dagon. It concludes that Dagon (the name related to the Hebrew for grain, dagan, rather then the Hebrew for fish dag – or nun, in Aramaic) was probably a version of the Aegean-Anatolian fertility mother goddess, Cybele.
In others words (for players of Call of Cthulhu, Dagon is really Shub-Niggurath…