Ailbe is the Old Irish form of Ailbhe, a name with uncertain etymology. It may derive from the Celtic root *albiyo- meaning "world", "light", or "white", or from Old Irish ail "rock". In Irish legend, Ailbhe (feminine) was a warrior of the Fianna. The name is also associated with Saint Ailbe of Emly. Saint Ailbe of Emly Saint Ailbe (Irish: Ailbhe; Latin: Albeus), also known in Welsh tradition as Elvis or Eilfyw, was a 6th-century bishop regarded as one of the four great patrons of Ireland, alongside Saints Patrick, Brigid, and Columba. He is considered the first bishop and patron saint of Emly in Munster, where he founded a monastery. Though his historicity is debated, his feast day is celebrated on 12 September. He is the patron saint of the Archdiocese of Cashel and Emly. Welsh sources from the 11th century associate him with Saint David, whom he allegedly baptized, and some lore even gives him a Welsh genealogy as an Ancient Briton. Related Names Related forms include the modern Irish Ailbhe, which is used for both genders in Ireland, as well as the Anglicized Elva and Alby. Key Facts Meaning: Possibly "world", "light", "white", or "rock" Origin: Old Irish / Celtic Type: First name, usage both male and female Usage Regions: Ireland (historical and modern), also Welsh tradition as "Elvis"