| Armagh: | 2 | Carlow: | 5 | Clare: | 7 | Cork: | 29 |
| Derry: | 1 | Dublin: | 5 | Dublin city: | 6 | Galway: | 1 |
| Kerry: | 1 | Kildare: | 8 | Kilkenny: | 8 | Laois: | 15 |
| Leitrim: | 1 | Limerick: | 16 | Mayo: | 2 | Meath: | 1 |
| Offaly: | 37 | Roscommon: | 2 | Tipperary: | 41 | Waterford: | 59 |
| Westmeath: | 9 | Wicklow: | 11 |
| de Treó | Troy: líonmhar: Lár na Tíre, Oir-dheisceart, Luimneach-an Clár-Tiobraid Árann. Angla-Normannaigh ón gcathair Fhrancach Troyes; dlúth-bhaint acu le Luimneach - féach Caladh an Treoigh, go bhfuil Castletroy air anois. Tá siad ann le h-ocht gcéad blian. |
| Ó Tréamháin | Troy: deir de Bhulbh gur bhain siad seo le iarthar an Chláir ach níl aon eolas eile fúthu - féach Ó Troighthigh. |
| Troy | numerous: Midlands, South East, Clare-Limerick-Tipperary etc. Ir. Ó Troighthigh, foot-soldier. A sept of Clare who migrated to Tipperary. However, the name has been associated with Limerick City since 1189, which indicates that they were Anglo-Normans there. In Irish they would be de Treo. Castletroy was Caladh an Treoigh. IF. |
Parishes where Troy and a second surname are found together
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