Eufydd

Etymology unknown.

Eufydd appears in a number of Welsh texts, spelled variously as Euuyd, Eueyed, Euyd and Ieunydd. He appears twice in the Book of Taliesin, and then again in Mawrnat Aeddon. It's implied that he is remembered as a skilled magician, intimately associated with his more illustrious brothers Gwydion and Gofannon, and with his uncle Math fab Mathonwy. Eufydd also appears in the genealogical tract Bonedd yr Arywr (The Descent of the Saints) in which he's listed among the children of Dôn.