Mac Dhuibh is a Scottish surname meaning "son of Dubh", where the byname Dubh means "dark". The name is a patronymic, reflecting a Gaelic naming tradition that identifies descent from an ancestor known as Dubh, likely a personal nickname based on hair color or complexion. This surname is closely related to Duff and MacDuff, which are anglicized forms or variants. In Ireland, the equivalent surname is Ó Duibh, also anglicized as Duff.
The name Mac Dhuibh is historically associated with the Scottish Highlands, where the Gaelic language persisted longer than in the Lowlands. The Clan MacDuff, one of the most powerful Scottish clans, is a prominent bearer of the name. The MacDuffs were the earls of Fife and played a significant role in medieval Scottish history, including providing leadership during the Wars of Scottish Independence. Despite anglicization, the Gaelic form Mac Dhuibh remains in use among families preserving their linguistic heritage.
- Meaning: "son of the dark one"
- Origin: Gaelic (Scottish)
- Type: patronymic surname
- Usage: primarily Scottish, also Irish
- Variants: Duff, MacDuff, Ó Duibh
Sources: Forebears — mac-dhuibh