Olwyn
Olwyn is usually spelled Olwen-- the -wen spelling is feminine in Welsh, while -wyn, is a masculine ending. The name is derived from the word ol, meaning "track; footprint," plus the ending -wen which comes from gwen meaning "white; blessed; holy." in Welsh mythology, Olwen was the heroine of the story "Culhwch and Olwen" in the Mabinogion.