I think it more likely that the Mesopotamian lore was based off Enoch then the other way around.
What the Mesopotamian lore includes is a character that some archaeologists believe is Enoch himself.
What all this lore actually does is paint a really interesting picture of what was going on in the world before and after the flood.
It sort of explains what was going on in the Gilgamesh epic and sort of shows how that mirrors (sort of) the Flood story and Genesis 6.;-)
Frankly this stuff makes my head spin but it very interesting if you are into archaeology, the Flood, Enoch, and the watchers.