McClintock is a surname of Scottish origin, deriving from an anglicization of a Gaelic name variously recorded as M'Ilandick, M'Illandag, M'Illandick, M'Lentick, McGellentak, Macilluntud, McClintoun, Mac Illiuntaig from the 14th century onward. The surname McClinton (MacClinton) is an anglicization of the same Gaelic name.