| Belfast city: | 1 | Clare: | 7 | Cork: | 11 | Cork city: | 1 |
| Galway: | 2 | Kerry: | 1 | Kildare: | 4 | Kilkenny: | 13 |
| Laois: | 1 | Limerick: | 66 | Limerick city: | 2 | Mayo: | 3 |
| Meath: | 2 | Offaly: | 6 | Roscommon: | 4 | Tipperary: | 17 |
| Waterford: | 15 | Wexford: | 3 |
| Dee | fairly numerous: Munster. Ir. Ó Diaghaidh (Ó Deaghaidh). See O'Dea. IF & SGG. |
| Ó Deaghaidh | O'Dea, Dee: líonmhar: an Clár, Luimneach, Ciarraí, Tiobraid Árann. Clann de chuid Dál gCas (sa Chlár) & ceann eile ag Sliabh Ardacha in oirthear Thiobraid Árann. Is cosúil gur ainm pearsanta Deaghadh as an bhfocal "deagh" = maith. Fuaimniú agus litriú nua: Ó Deá. Féach Ó Diaghaidh, leis. IF. |
| O'Dea | numerous: N Munster, Connacht, Midlands. Ir. Ó Deághaidh (Deá). There were septs in Clare and Tipperary. See also Dee. IF. |
Parishes where Dea and a second surname are found together
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