The first man in Norse mythology is Ask, also called Askr in Old Norse.
Ask appears in the creation story of the first human pair, Ask and Embla. According to the myth preserved in the Poetic Edda and retold in Snorri Sturluson’s Prose Edda, the gods found two pieces of driftwood or trees on a shore. Odin and his divine brothers gave them human qualities, transforming the lifeless wood into the ancestors of humanity.
Ask was the male figure, while Embla was the female figure. Different versions assign the gifts slightly differently, but the gods are generally said to have given them breath or spirit, understanding, movement, speech, sight, and hearing. The pair then lived in Midgard, the human world protected by the gods.
Ask is often confused with Ymir, Buri, or Borr. Ymir is a primordial giant and ancestor of the jötnar; Buri is an early divine ancestor; and Borr is Buri’s son and the father of Odin, Vili, and Vé. None of those figures is the first human man. Ask and Embla are the first human couple.