His line is interesting however. From the DNA matches they have they seem to be native Irish and certainly a distant link to the area south of Dublin, in the Wicklow Mountains. Another fascinating fact was discovered in the DNA testing, the family of Thomas McKean the Signer is the same as Alexander McCaine, the Southern antebellum Methodist minister and writer. That McCaine family we know is from County Cavan, near the village of Virginia. A fascinating McCain family, but no relationship to our McCains.