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| Ó Síodhacháin | Sheehan: an-líonmhar ar fud na tíre - sa Mhumhain go sonrach. Clann de chuid Dál gCais a bhí suite ar dtús in Uí Conaill Gabhra, Luimneach .i. abhantrach na Daoile. Tugtar an bhrí, de ghnáth, mar síodhach = síochánta ach tá an dara tuairim ann gurab é an an focal ón Sean-Ghaeilge sídach = mactíre, is bun leis. Mícheál Ó Síocháin (1870-1945), ard-easpag Sydney na h-Astráile, bhí sé ina bhunaitheoir ar Choláiste na Rinne, 1909. Litriú nua: Ó Síocháin. |
| O'Sheehan | Very rare: Dublin. Ir. Ó Síothcháin. See Sheehan. |
| Sheahan | numerous: mainly Munster.Ir. Ó Síodhcháin, perhaps from sítheach (peaceful). A sept of Dál gCais in W Limerick. See also Sheehan. IF. |
| Sheehan | Very numerous: all areas, especially Munster.Ir. Ó Síodhcháin, sítheach, peaceful. However, the Old Irish sídeach means "wolf" and the Scottish Highland Shaws derive from it, so Sheehan may not be entirely non-violent. See also Sheahan. SI & IF. |
Parishes where Sheehan and a second surname are both baptised.
This list shows total Sheehan Roman Catholic baptisms by county.
Click on the county to see detail.