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| 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 a Crossen and a second surname married each other.