What was the primordial void called?

The primordial void in Norse creation mythology was called Ginnungagap.

The name appears in the Poetic Edda and in Snorri Sturluson’s Prose Edda, especially Gylfaginning. It describes a vast, supernatural gap that existed before the ordered world. In Snorri’s account, the icy realm Niflheim lay to its north, while the fiery realm Muspell lay to its south.

When cold rime from Niflheim met heat and sparks from Muspell across Ginnungagap, the ice melted. Those drops gave life to Ymir, the primordial giant, while the primeval cow Auðumbla also appeared. Later, Odin, Vili, and Vé killed Ymir and fashioned the world from his body.

Ginnungagap is often confused with Yggdrasil, Asgard, or Valhalla. Yggdrasil is the cosmic tree, Asgard is the gods’ stronghold, and Valhalla is Odin’s hall for honored slain warriors. Ginnungagap belongs specifically to the creation story and predates the inhabited cosmos.