Are they merely branches of the O'Rourkes, as some claim?
Of these families, only the Mac Tigernains of Tellach Dunchadha in the barony of Tullyhunco in Co Cavan are easily identifiable, since they appear prominently in the annals of Ireland.
The DNA test that 111 Mac Tighernans took proved that both The O'Rorke and the O'Connor Don are not linked genetically to us.
Based on the DNA test for 111 Mac Tighernans, it appears that the tested Mc Ternans fall into 19 separate genetic groups.
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