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| Ó Reannacháin | Renehan, Ranahan, Ronaghan: líon beag: an Mhí-Muineachán-Ard Mhacha-an Dún, Cill Chainnigh & Luimneach. Clann de chuid Oirghialla - b'fhéidir gur craobh an dream i Luimneach (Ranahan) atá lonnaithe in Uíbh Rosa ar bhruach na Sionainne. Tá an mí-aistriú Ferns le fáil i Laois. Brí: reannach, biorach, géar. |
| Ranaghan | fairly rare: Limerick, Down. Ir. Ó Reannacháin, from reannach, spear-like. A sept of Oriel (Armagh etc). The Limerick group, who are located at Iverus near Askeaton, may be a junior branch, or entirely separate. |
| Renehan | Quite numerous: Meath-Monaghan-Armagh, Kilkenny. Ir. Ó Reannacháin, from reannach, spear-like. The name belongs to Oriel (Armagh-Monaghan etc). See also Ronaghan and Ferns.MIF. |
Parishes where a Renaghan and a second surname married each other.