Llewellyn

The Llewellyn surname is derived from the Welsh personal name Llewellyn, which was also spelled Llywelin. This name is often explained as meaning lion-like but, is in fact probably derived from the Welsh word "llyw," which means leader. The Welsh double l was a constant source of trouble to English speakers, and was often translated "f." "A very ancient Welsh personal name, borne by many princes and magnates of Celtic origin."