Possibly from
cyrrid "bent, crooked" (a derivative of Old Welsh
cwrr "corner") combined with
ben "woman" or
gwen "white, blessed". According to the medieval Welsh legend the
Tale of Taliesin (recorded by Elis Gruffyd in the 16th century) this was the name of a sorceress who created a potion that would grant wisdom to her son Morfan. The potion was instead consumed by her servant Gwion Bach, who was subsequently reborn as the renowned bard
Taliesin.
This name appears briefly in a poem in the Black Book of Carmarthen in the form Kyrridven [1] and in a poem in the Book of Taliesin in the form Kerrituen [2]. Some theories connect her to an otherwise unattested Celtic goddess of inspiration, and suppose her name is related to Welsh cerdd "poetry".