While Kieran seems to be all the rage lately, no one pays attention to the Cornish version of the name, meaning "little black one." Pieran is the same as Kieran because of the rule of language making the Gaelic "k" a "p" in Cymric. A transcription of Piran, sometimes written Perran, or even Perrian and Pierrian, this is the patron saint of miners and of Cornwall. The name is basically unheard of, unused in the U.S.
Some locations bear this name in Cornwall. Saint Piran died c. 480 after being an abbot, with possible Irish roots. He is linked to the Irish saint Ciaran of Saigir. His legend starts with being thrown over a cliff into the sea tied to a boulder. He calms the sea and floats to safety in Cornwall, becomes a hermit with great qualities so he is gifted the ability to perform miracles. Then he made the Abbey of Lanpiran with his followers and helped the community perfect the art of tin-smelting. His flag is a white cross on a black background, often used to represent Cornwall.