Interestingly JJ 'Elvis' owes it's origin to the Irish.
//Elvis is a given name. It is an Anglicisation of the name of the Irish saint Ailbe of Emly.[1] The earlier meaning of Ailbe is uncertain; it may have been understood in the Middle Ages to derive from Irish ail, 'rock',[2] 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;[3] it is possible that this claim is inspired by the existence of the Old Norse mythological name Alvíss.[4] 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.//