One note, I work with DNA testing of Gaelic names from Islay, Argyle, Ulster, etc., and the one McQuilkin that I've seen his test results does not match any Wilkinson, or Wilkie, etc., You would not have an anglicised form coming from another anglicised form. I've been trying to communicate with some Islay Gaelic speakers to ask them, there are still plenty there. Wilkie would be a 'translated' anglicised form where as McQuilkin would be a phonetic anglicised form. The name is likely from Mac Uilcín (a diminutive of Liam or Uilliam, i.e. William)... but I've also heard that it could be a slender vowel form of Mac Colgáin, i.e. Mac Cuilgin. DNA testing can confirm this one way or the other. So Mac Uilcín most likely I'd think, but Mac Cuilgin certainly a possibility. Barra McCain