| Kernan | Quite numerous: Armagh-Tyrone-Monaghan etc. Ir. Mac Thighearnáin, tighearna, lord. Also as MacKiernan who were a sept of Breifne (Cavan-Leitrim). |
| Kiernan | numerous: Cavan-Monaghan-Longford etc. Ir. Mac Thighearnáin, tighearna, lord. A number of septs in Connacht and Ulster. MacTernan is a variant. IF & SGG. |
| Mac Thighearnáin | Mac Kiernan, Kiernan: líonmhar: taobh thuaidh de Lár na Tíre agus Connachta. Teallach Dhonncha a n-ainm clainne agus, dá bhrí sin, an ceantar ina raibh cónaí orthu - Tullyhunco atá air anois, faraoir. Bhain an dream sa leis na Ruarcaigh i mBreifne. Bhí clann eile i Ros Comáin, gaolmhar le muintir Chonchúir, ríthe Chonnacht. Fréamh, ar ndóigh, tiarna. Litriú nua: Mac Thiarnáin. IF. |
| MacKernan | numerous: Ulster generally, especially Tyrone. Ir. Mac Thiarnáin (lordly). See Mac Kiernan. |
| MacKiernan | numerous: N Midlands, Connacht etc. Ir. Mac Thighearnáin, from tighearna, lord. A sept of Breifne with other groups in Connacht and Fermanagh. MIF. |
Parishes where Keernan and a second surname are found together
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