Govannon

In 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)