Elvis is a given name. It is an Anglicisation of the name of the Irish saint Ailbe of Emly. The earlier meaning of Ailbe is uncertain; it may have been understood in the Middle Ages to derive from Irish ail, 'rock', but this is unlikely to have been its historical meaning. In internet sources, the name is widely claimed to derive from Old English Eall-wīs, meaning "all-wise", but the development of w > v would be irregular and the name is not, in any case, attested in Anglo-Saxon sources; it is possible that this claim is inspired by the existence of the Old Norse mythological name Alvíss. Other alternative etymologies have been proposed for the name, including that it is derived from the surname Elwes, and that it is related to the name Alwyn.