The story
- Scottish Gaelic · derived fromMac Dhabhoig“son of Davuc”
- English todayMcGuffey
It could be a variant of the surname McDuffie. Alternatively, it may be an Anglicized form of Scottish Gaelic Mac Dhabhoig (“son of Davuc”), a diminutive of the personal name David.
Etymology from Wiktionary, CC BY-SA 4.0.