| Antrim: | 73 | Armagh: | 49 | Belfast city: | 27 | Cavan: | 38 |
| Derry: | 34 | Donegal: | 109 | Down: | 169 | Dublin city: | 8 |
| Fermanagh: | 20 | Galway: | 4 | Laois: | 1 | Leitrim: | 11 |
| Longford: | 13 | Mayo: | 4 | Meath: | 1 | Monaghan: | 15 |
| Sligo: | 12 | Tyrone: | 46 | Westmeath: | 1 |
| MacIlmurray | rare: Belfast area. Ir. Mac Giolla Mhuire, Muire, the Blessed Virgin. The name was associated with W Ulster. See also Gilmore. |
| MacMorrow | numerous: mainly Connacht. Ir. Mac Muireadhaigh (mariner). A name associated with the O'Rourkes of Breifne. |
| MacMurray | numerous: E Ulster etc. Ir. Mac Muireadhaigh, (mariner). Mod. Mac Muirí, a sept of Leitrim, but mainly Scottish from Galloway. SS. |
| Morrow | Very numerous: mainly Ulster. English toponymic generally; it may stand for Mac Morrow in W Ulster & Connacht. |
| Murray | Very numerous: all areas. Ir. Ó Muireadhaigh, Mac Muireadhaigh. These derive from the popular first name Muireadhach, lord, master. The name extended to Scotland whence many present-day Murrays in Ulster. See also Murrihy. IF. |
Parishes where Morrow and a second surname are found together
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