| Armagh: | 4 | Belfast city: | 1 | Carlow: | 13 | Cavan: | 1 |
| Cork: | 6 | Down: | 2 | Dublin: | 1 | Fermanagh: | 7 |
| Galway: | 5 | Kilkenny: | 8 | Laois: | 3 | Leitrim: | 4 |
| Louth: | 17 | Mayo: | 1 | Monaghan: | 1 | Roscommon: | 17 |
| Tyrone: | 1 | Waterford: | 2 | Wexford: | 8 | Wicklow: | 1 |
| Lannin | Quite numerous: all areas, especially South East. Ir. Ó Leannáin or Ó Lonáin. See Lennon. |
Parishes where Lannon and a second surname are found together
Click here to see all variants on a single map
Click on a name to see it on the map.
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