| Morgan | Very numerous: all areas, especially Belfast-Down-Armagh-Monaghan-Cavan-Louth. Ir. Ó Muireagáin, dimin. of muire, a lord. It is also a prominent Welsh name, accounting for many of the Irish Morgans. SI. |
| Murchan | fairly rare: Armagh-Louth, Donegal etc. Ir. Ó Murcháin, dimin. of Murchadh (sea-warrior). Woulfe found septs in Offaly and Galway. |
Parishes where Murchan and a second surname are found together
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