While not concrete, the origin of the Gungnir can flow into Teutonic myth, going back to the dwarf Dvalin, who is credited with inventing dunes. He created the Gungnir, as well as the ship Skidbladnir. He also made a beautiful golden wig to compensate for Sif's own hair, when it was chopped off by Loki.Gungnir -- In Norse myth, Gungnir, "Spear of Heaven", is big daddy Odin's weapon of choice. Gungnir's origin is unknown... Odin found it on the Plains of Ida and used it to fashion Asgard as it is known today.
In the Canaanite pantheon, Dagon was sometimes associated with the half-fish female deith Derceto, which may account for the theory of Dagon being portrayed as half-fish himself. Half-fish, water, ice...it's closer to the ideal, albeit pretty damn far away.Ice Staff: Dagon -- In ancient Mesopotamian myth, Dagon, meaning "corn", was the god of vegetation. He passed his knowledge of farming to humans, allowing them to settle down and create history's earliest recorded non-nomadic civilization, Mesopotamia. What this has to do with ice is anybody's guess.
I found all these in Encyclopedia Mythica, one of GG!'s sources when he made the page. The reason none of this is in that page is because the articles I found these in were only posted in the last three years. The former was posted on April 27, 2002, and can be found here. The latter was posted on November 14, 2004, and can be found here.
Just tying up some loose ends. Call me obsessive-compulsive if you'd like, but I just thought they'd be of some (if infinitessimally small) use.