According to Black's Surnames of Scotland (the standard work) Macgillivary means 'son of the servant of judgement (doom)'. They were an old Argyll clan or sept. A Farquhar M'Gillevray [sic] of Dunmaglass [sic - seems MacColl got the place name wrong] was one of the signers of the letter to George I in 1715. MacGillivrays [sic] took a prominent part in the rebellion of '45 and their chief is said to have been killed at the battle of Culloden, beside the Well of the Dead.

From Johnston's Gazettter of Scotland (second ed. 1958) "Dunmaglass, estate and shooting-lodge, E Inverness-shire, 5.5 miles E[ast].N.E. of Foyers".