| Antrim: | 14 | Armagh: | 59 | Belfast city: | 44 | Carlow: | 27 |
| Cavan: | 1759 | Clare: | 22 | Cork: | 143 | Cork city: | 23 |
| Derry: | 18 | Donegal: | 24 | Down: | 69 | Dublin: | 193 |
| Dublin city: | 129 | Fermanagh: | 174 | Galway: | 233 | Kerry: | 50 |
| Kildare: | 105 | Kilkenny: | 72 | Laois: | 62 | Leitrim: | 177 |
| Limerick: | 25 | Limerick city: | 9 | Longford: | 384 | Louth: | 186 |
| Mayo: | 290 | Meath: | 579 | Monaghan: | 135 | Offaly: | 29 |
| Roscommon: | 64 | Sligo: | 29 | Tipperary: | 65 | Tyrone: | 32 |
| Waterford: | 29 | Westmeath: | 205 | Wexford: | 107 | Wicklow: | 102 |
| Ó Raghailligh | O'Reilly: an-líonmhar tríd an dtír: in Ulaidh & Laighin thuaidh go sonrach. Ceann de mhór-chlanna na nGael a d'áitigh Breifne (Cabhán-Liatroim). Bhíodar páirteach in éirí amach 1641 agus cogadh an Dá Rí ach choimeád siad roinnt mhaith talún síos tríd na blianta. D'fhoillsigh Edward O'Reilly foclóir Gaeilge-Béarla i 1817. An bhrí - níl ann ach tuairim - cróga. |
| O'Reilly | Very numerous: all areas, especially Ulster and N Leinster. Ir. Ó Raghallaigh. One of the leading septs of Breifne (Cavan). Synonyms: Reilly, Riley. IF. |
| Reilly | Very numerous: all areas, especially N Leinster and S Ulster. Ir. Ó Raghallaigh. A leading sept of Breifne located in Cavan. See also O'Reilly. IF. |
| Riley | Quite numerous: E Ulster, Dublin-Wicklow. Variant of Reilly, q.v. |
Parishes where Reilly and a second surname are found together
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