The Babylonian flood hero who survived in an ark in the Epic of Gilgamesh is Utnapishtim.
In the flood story embedded in the Standard Babylonian Epic of Gilgamesh, the god Ea warns Utnapishtim to build a large boat and preserve life from a divinely sent flood. Utnapishtim later releases birds to test whether the waters have receded. The episode is one of the best-known ancient Near Eastern flood narratives.
Utnapishtim is not the same character as Noah. The stories share motifs such as divine warning, a vessel, survival, birds, and a post-flood sacrifice, but they belong to different literary and religious traditions. Utnapishtim also tells Gilgamesh that the gods granted him immortality.
The flood account in the Epic of Gilgamesh draws on earlier Mesopotamian traditions, especially the Atrahasis story. Confusing Utnapishtim with Gilgamesh is another common error: Gilgamesh is the king and seeker who hears the account, while Utnapishtim is the survivor.