The Mesopotamian flood hero in the Atrahasis epic is Atrahasis.
The Atrahasis epic is an ancient Akkadian literary work that includes a flood story in which the god Enki warns Atrahasis about the coming catastrophe. Atrahasis builds a large boat, takes aboard living creatures, and survives while the flood destroys the wider population.
The text is important for the study of flood traditions because it predates many surviving manuscripts of the biblical Genesis account and shares several broad narrative elements with it. The stories are not identical: their gods, motivations, chronology, and theological meanings differ substantially.
Atrahasis is sometimes confused with Utnapishtim, the flood survivor in the Epic of Gilgamesh. Utnapishtim's story incorporates material related to older Mesopotamian traditions, including the Atrahasis narrative. Both names therefore belong to Mesopotamian literature, not to the Genesis account itself.