Clan Conchobhair, of the Cenél Éoghain, said to be originally of Magh Ithe and certain septs moving into county Derry about the 10th-11th century. Conchobhar was the son of Fergal, and the great-great grandson of Aedh Uairidhnach, whose descendants included O'Cathain (O'Kane and O'Cane), O'Mullan, MacCloskey and the Clan Diarmatta.
The O'Kanes were lords of Creeve (Coleraine area) and Keenaght beginning about the 12th century when they overshadowed the O'Connors of Glengiven (modern Dungiven), and Fir na Craoibhe. An early Clan Conchobuir [Fer Maige Ítha] genealogy: (Rawlinson) Máel Ruanaid m. Áeda m. Ruaidrí m. Óengusa m. Cairelláin m. Baígill m. Diarmata m. Conchobuir m. Fergaile m. Máele Dúin m. Máel Fithrich m. Áeda Uaridnaich m. Domnaill m. Muircherdaich m. Muiredaich m. Éogain m. Néill Noígiallaig.
Fir na Craoibhe - or Creeve, near Coleraine, on the west of the river Bann, where Eas Craoibhe, or the Cutt's Fishery, is located, according to O'Donovan (Four Masters). It is equated with Faranacryve in the barony of Keenaght, county Derry, in Primate Colton's Visitation. The Cenél mBinnigh, of the Cenél Éoghain are cited to have migrated to this area at an early date. Later, the Clan Conchobhair, of the Cenél Éoghain, migrated into this region, the Ua Cathain (O'Kane) noted as chiefs of Fir na Craoibhe by the 12th century.