What is the name of the primordial cow in Norse creation myth?

The primordial cow in Norse creation myth is Auðumbla.

Auðumbla appears in Snorri Sturluson’s Prose Edda, specifically the Gylfaginning section. In the frozen emptiness of Ginnungagap, the primeval cow nourished the giant Ymir with four rivers of milk flowing from her teats. She sustained herself by licking salty, frost-covered stones.

After three days of licking the rime rocks, Auðumbla revealed Búri, the first ancestor of the gods. Búri fathered Borr, who became the father of Odin, Vili, and Vé. This makes Auðumbla important to both sides of the mythic family tree: she feeds Ymir, ancestor of the jötnar, while also bringing forth Búri, progenitor of the Æsir.

Her name has variant spellings, including Auðhumla and Auðumla, but these are forms of the same figure. She is sometimes confused with Heiðrún, the goat whose milk or mead sustains warriors in Valhalla; Heiðrún is not the primordial cow.