Arthur, William (1857) An Etymological Dictionary of Family and Christian Names. New York: Sheldon, Blakeman. Public Domain.
CLOUGH
As described in historical dictionaries
An Etymological Dictionary of Family and Christian Names (1857)
(origin: Anglo-Saxon. Local) A small valley between hills, a breach; from the past of the Anglo-Saxon participle cleofian, to cleave, divide.
Patronymica Britannica (1860)
CLOUGH. A ravine, glen, or deep descent between hills. N. of Eng. Cloff, Scotl. The Cloughs of Plas-Clough claim a Norman origin, from the Seigneurs de Eohan, and appeal to their name and arms for proof. B.L.G. To my e)'e, both arms and name are as English as need be.
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: English
Region of origin: British Isles
Country of origin: England
Religion of origin: Christian
Language of origin: English