I wonder if those who came after Gilgamesh and looked back on his tale of a worldwide flood and how God saved him, because he was different, felt the same way. Probably, since Noah's tale was an update, using a Hebrew name, of the famous Sumerian tale of Gilgamesh.

Or if Gilgamesh had daughters who got him drunk then used him to impregnate themselves, as happened [sic] to "Noah".

Inbreeding to reopulate the earth- an interesting thought...