| Mac Giolla Tighearnaigh | Tierney: líon beag: Fear Manach-Tír Eoghain-Doire. |
| Ó Tighearnaigh | rare: Dublin. Ir.Lang. See O'Tierney and Tierney. IF. |
| Ó Tighearnaigh | Tierney: an-líonmhar ar fud na tíre, seachas Corcaigh. Clann éagsúla: (1) i gCeara, Maigh Eo; (2) craobh de Chineál Eoghain i dTír Chonaill; (3) craobh des na Niallaigh san Iar-Mhí. Scaipeadh iad go léir agus bhí siad le fáil i nGaillimh, Luimneach agus Tiobraid Árann. Féach Mac Giolla Tighearnaigh, leis. Fréamh: tighearna (tiarna). Litriú nua: Ó Tiarnaigh. IF. |
| O'Tierney | fairly rare: Down, Galway etc. Ir. Ó Tighearnaigh, tighearna, lord. There were septs in Donegal, Mayo and W Meath. See also Tierney. (Mod. Ir. Ó Tiarnaigh). In Ulster there was a cognate name: Mac Giolla Tiarnaigh. IF & SGG. |
| Tierney | Very numerous: all areas, except Cork. In the north, they are numerous in Fermanagh-Tyrone-Derry. Ir. Ó Tighearnaigh, tighearnach, lordly. A number of septs existed: Mayo, W Meath, Donegal, but they have long been dispersed. IF. |
Parishes where Tierny and a second surname are found together
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