C. Thomas Cairney, the O'Kennedys were one of the chiefly families of the Dal gCais or Dalcassians who were a tribe of the Erainn who were the second wave of Celts to settle in Ireland between about 500 and 100 BC.

History

Prior to the availability of DNA testing in 2004 it was a general assumption that all Irish Kennedys were related. Current Y DNA testing proves that there were earlier

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