Llangua is named after Saint Ciwa, anglicised as St Kew, a local girl who had founded the church there. Tasked on a journey to Cornwall with ridding the region of a man-eating boar, or bear, she instead tamed the animal which became her companion (alternatively, inspired the locals to hunt it down and kill it). She was then allowed to found a religious community around which grew up the settlement of St Kew, Cornwall.