Dagon

" Then suddenly I saw it. With only a slight churning to mark its rise to the surface, the thing slid into view above the dark waters. Vast, Polyphemus-like, and loathsome, it darted like a stupendous monster of nightmares to the monolith, about which it flung its gigantic scaly arms, the while it bowed its hideous head and gave vent to certain measured sounds. I think I went mad then."

"Dagon" by H.P.Lovecraft.
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In Biblical context, Dagon is the Semitic Fish God, God of Philistines. It was represented in the combination of both man and fish. The name "Dagon" is derived from "dag" which means "fish."