Last name origin & meaning:
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.
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