| Logan | Very numerous: all areas, especially Ulster. Ir. Ó Leocháin, a sept of W Meath at the Invasion, they were dispersed through Connacht. Ulster Logans are part indigenous, part Scottish and the Normans added de Logan to the Ulster scene in 12 cent. MIF. |
| MacLogan | Very rare: Newry (Down). Probably relates to Scots clan Logan (MacLennan). |
Parishes where Logan and a second surname are found together
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