Goibniu

In Irish mythology Goibniu or Goibhniu was a son of Brigid and Tuireann and the smith of the Tuatha Dé Danann. He and his brothers Creidhne and Luchtaine were known as the Trí Dée Dána, the three gods of art, who forged the weapons which the Tuatha Dé used to battle the Fomorians. His weapons were always lethal, and his beer gave the drinker immortality. He may also have been a thunder god.

His Welsh equivalent was Govannon.