Govannon

In the Celtic mythology of Wales and Cornwall ('Insular Brythonic mythology'), Govannon (Welsh) was the son of Danu and Beli or Brigid and Tuireann. He killed his nephew, Dylan, not knowing who he was. He was a smith god who created magical swords for the Tuatha de Danaan, along with Credne and Luchtainel. He was also a god of alcohol; his beer gave the drinker immortality.

Alternative: Gofannon, Goibniu (Irish)