Introduction
Utnapishtim is the sole survivor of the Mesopotamian great flood, granted immortality afterward by the assembled gods, known by different names (Ziusudra, Atrahasis) across the Sumerian and Akkadian versions of the flood story.
Family
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The Flood and Its Aftermath
Warned secretly by Enki/Ea of Enlil's plan to destroy humanity with a flood, Utnapishtim built a great boat and preserved his family, craftsmen, and "the seed of all living things," surviving the deluge that killed the rest of humanity. Afterward, the gods, moved by Enlil's excess and Ea's intervention, granted Utnapishtim and his wife immortality and settled them at the ends of the earth. When Gilgamesh seeks him out in his own quest for eternal life, Utnapishtim recounts this flood story at length and sets Gilgamesh an impossible test (staying awake for six days and seven nights) that Gilgamesh fails, demonstrating that his own path to immortality does not lie through emulating Utnapishtim's singular, divinely granted exception.
Mesopotamian religion spans Sumerian, Akkadian, and Babylonian sources composed and recopied across nearly three thousand years, so names, genealogies, and even a deity's role often shift between traditions (Sumerian An/Enki/Inanna alongside their Akkadian/Babylonian forms Anu/Ea/Ishtar); the account above follows the most widely attested version, usually as consolidated in the Babylonian Enuma Elish or the standard Akkadian Epic of Gilgamesh.