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| Laghey | Very rare: Tyrone. Possibly a variant of Lahy, q.v. |
| Lahy | Very rare: Kilkenny. Ir. Ó Lathaigh, from Ó Laithimh. See Lahiff. This name has become confused with Leahy, which is more numerous. MIF. |
| Leahy | Very numerous: all areas, especially Munster & South East. Ir. Ó Laochdha (heroic). Some confusion with Ó Lathaigh, which appears as Lahiff, q.v. |
| Ó Laochdha | Leahy: an-líonmhar gach treo - sa Mhumhain agus san Oir-dheisceart go sonrach. Bhí an sloinne coitianta i dTiobraid Árann & Corcaigh sa 16 céad agus tá fós. Tá meascadh éigin le Ó Lathaigh, q.v. Brí: cróga, curata. Litriú nua: Ó Laocha. |
| O Laoithe | rare: Dublin etc. Ir.Lang. Variant of Ó Laochdha, Leahy, q.v. |
Parishes where Leeahy and a second surname are both baptised.