McClintock

From Wiki

Scottish and northern Irish: Anglicized form of Gaelic Mac Gille Fhionndaig (Scottish), Mac Giolla Fhionntóg (Irish) ‘son of the servant of (Saint) Finndag’, a personal name derived from a pet form of fionn ‘white’. According to Woulfe, the Scottish family settled in Donegal in the late 16th century.

This name is often shortened to McLintock