The name MacCallum means a follower of Columba, and Argyllshire is appropriately the home of the clan. The history of the clan is so inextricably connected with that of the Malcolms that it is difficult to separate them. In fact, the two names may correctly be considered as applying to the one clan. The Clan Calum is said to have been originally designated as of Ariskeodnish.

Lands in Craignish and on the banks of Loch Avich were granted by Sir Duncan Campbell of Lochow, in 1414, to Reginald MacCallum of Corbarron, with the office of hereditary constable of the castles of Lochaffy and Craignish. Corbarron was bequeathed by the last of the family to Zachary MacCallum of Poltalloch, a supporter of the Marquess of Argyle, and renowned for his strength, was killed by Sir Alexander MacDonald at Ederline in 1647. He had slain seven of the enemy when he was attacked by Sir Alexander, and was likely to overpower him also, when MacCallum was attacked from behind by a man of the opposing force with a scythe.

Dugald MacCallum of Poltalloch, who succeed to the estate in 1779, is said to be the first to adopt the name Malcolm permanently.

Crest: A tower, proper, cupula and flag, gules. Badge: Mountain ash.