Isfael

Isfael or Ismael (Old Welsh:Ysmail), often anglicized as Ishmael, was an AD 6th-century medieval Welsh bishop of Rhos and saint. He was allegedly also a Breton prince of Armorica.

Although his anglicized name invites association with the Biblical Ishmael, Isfael is actually a native Welsh name (or even epithet) meaning 'under prince'.