Arthur, William (1857) An Etymological Dictionary of Family and Christian Names. New York: Sheldon, Blakeman. Public Domain.
BLACKWOOD
As described in historical dictionaries
An Etymological Dictionary of Family and Christian Names (1857)
(origin: Local) This family derived their name from the lands of Baron Dufferin and Claneboye, in Scotland, called Blackwood.
Patronymica Britannica (1860)
BLACKWOOD. Lord D ufterin descends from a Scottish family. Adam B. was one of the privy-council to Mary, Queen of Scots. I find no locality of this name in North Britain, except the Blackwood Hills, CO. Dumfries.
Lower, Mark A (1860) Patronymica Britannica: a dictionary of the family names of the United Kingdom. London: J.R. Smith. Public Domain.
Surname type: Location or geographical feature
Origin: Celtic
Region of origin: British Isles
Country of origin: Scotland
Religion of origin: Christian
Language of origin: Gaelic