1) Smithing god 2) Welsh mythology 
Gofannon is a Middle Welsh reflex of Gobannus, one of the deities worshipped by the ancient Celts. He features in Middle Welsh literature as a great metal worker and as the son of Dôn. His name can be compared with the Old Irish gobae ~ gobann ‘smith,’ Middle Welsh gof ~ gofein ‘smith,’ Gallic gobedbi ‘with the smiths,’ Latin faber