Humans have been working with metal for a long time: from the Copper Age (approx. 3500 – 1700 BCE) when the soft, malleable metal was the first to be smelted and used. So it’s not surprising that many cultures have smith-gods, and that in the Celtic world the smith-god and his name occur in Gaul, Wales, England and Ireland, making him one of the few pan-Celtic deities.1
And a very literal one – Goibniu, Gofannon and Cobannos all mean “Smith”.