As Bishop of Dunkeld, Cormac was responsible for a diocese that stretched from Dunkeld in the east to Lorn in the west, and from Kintyre in the south to Ross in the north; hence his nickname “Gilleasbuig Mor” or the Great Bishop. He was also the ancestor of a number of other clans, including the Mackinnons and the Macfies.
Little is known about Maolan, but it’s possible his tonsure was memorable because he had it done as a pilgrim or crusader to the Holy Land, rather than just as a churchman.
Malcolm or Maol-Challuim gave his name to the MacCallums (later the Malcolms) in Lorn, and as a devotee of Saint Catan is probably the Gille-Chattain from whom the Scottish Clan Chattan took their name.
Dougall is remembered as “Dall” (blind) in Clan Chattan history, but the saint that he personally revered was probably Fillan, with the result that he was remembered as Gille-Fhaolain. He or his son Dougal also gave their name to the MacCouls (i.e. MacDhughaills) of Craignish in Lorn.
Cathan was named for Saint Catan, and documented in Galloway as Cane Mcgillolane (i.e. MacGhille-Fhaolain). He was the ancestor of Clan MacGhille-Fhaolain or MacLellan in Galloway.
Lachlan’s participation in the battle of Harlaw was recorded in retrospect by the Clan Donald shennachies: There were four that went out with the army before any part of the main force went out with them; viz: Tormod MacLeod and Torcuill his brother, Lochluinn MacGillemhaoil, and Giolla Padraig MacRuaighri. Gille Padraig MacRuaighri and Lochluinn MacGillemhaoil were killed, but Tormoid and Torcuill escaped safe from the pursuit. The photo is of the monument memorializing the battle. Click to read more at Undiscovered Scotland.