| Antrim: | 9 | Armagh: | 3 | Belfast city: | 3 | Cavan: | 5 |
| Derry: | 13 | Donegal: | 51 | Down: | 12 | Kerry: | 1 |
| Leitrim: | 1 | Longford: | 1 | Monaghan: | 1 | Offaly: | 10 |
| Tyrone: | 5 |
| Crossan | numerous: Donegal-Derry and Ulster generally. Ir. Mac an Chrosáin, crosán was a jester or satirist in medieval Ireland. Two septs of this name: one in Ulster, the other in the Midlands. See also Cross. SI. |
| Mac an Chrosáin | Mac Crossan, Crossan : líonmhar: Tír Conaill-Doire & rl. Bhí clann amháin i dtuaisceart Uladh agus ceann eile i Lár-Laighean a bhí ina bhfilí ag na Mordhaigh agus Ó Conchúir. Galldaíodh iad sa 16 céad agus deineadh Crosby díobh. Fir magaidh a b'ea na crosáin - níos lú ná file ná bard ó thaobh céimíocht de.MIF. |
| MacCrossan | fairly numerous: Tyrone-Donegal & Ulster generally; Kildare and scattered in the south. Ir. Mac an Chrosáin, crosán, a rhymer, entertainer. There were families in Tyrone and Kildare - the latter now usually Crosby. SGG. |
Parishes where Crossan and a second surname are found together
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