Lukes, Lucas
Lukes, Lucas—These two names in Ulster and the West of Scotland are anglicised forms of MacLucais, a Clan Lamond sept. The Isle of Man form is Clucas, the "Ma" of "Mac" dropped.
Alphabetical Index of Anglicised Surnames in Ireland
See also Woulfe’s Irish Names and Surnames
… and O'Hart's Irish Pedigrees