[W, alchemist, magician; cf. W, fferyll, Virgil].
A name often translated as fairy, although it derives from the Welsh name for the Roman poet Virgil (70–19 bc), often perceived as a magical figure in medieval Europe. Ceridwen consulted the books of the fferyllt in preparing her cauldron of inspiration from which Gwion drank.
See Juliette Wood, ‘Virgil and Taliesin: The Concept of the Magician in Medieval Folklore’, Folklore, 94 (1983), 91–104.