Lower, Mark A (1860) Patronymica Britannica: a dictionary of the family names of the United Kingdom. London: J.R. Smith. Public Domain.
CAVENDISH
As described in historical dictionaries
Patronymica Britannica (1860)
CAVENDISH. Roger de Gernon, a cadet of the great Norman family, temp. Edw. II., acquiring with the heiress of John Potton, the lands of Cavendish, co. Suffolk, adopted De Cavendish for his surname. Peerage.
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