Arthur, William (1857) An Etymological Dictionary of Family and Christian Names. New York: Sheldon, Blakeman. Public Domain.
DUFF
As described in historical dictionaries
An Etymological Dictionary of Family and Christian Names (1857)
In the Gaelic, signifies black, but in the Cor. Br. and Welsh, a captain.
Patronymica Britannica (1860)
DUFF. " This noble family is derived from Fife Mac-Duff, who Avas a man of considerable Avealth and poAver in Scotland temp, king Kenneth II., and gave that prince great assistance in his Avars Avith the Picts about the year 831." Kemieth made
Lower, Mark A (1860) Patronymica Britannica: a dictionary of the family names of the United Kingdom. London: J.R. Smith. Public Domain.
Surname type: From given name or forename
Origin: Celtic
Region of origin: British Isles
Country of origin: Scotland
Religion of origin: Christian
Language of origin: Gaelic