Lower, Mark A (1860) Patronymica Britannica: a dictionary of the family names of the United Kingdom. London: J.R. Smith. Public Domain.
THORNHILL
As described in historical dictionaries
Patronymica Britannica (1860)
THORNHILL. A parish in Yorkshire. The family, who were there seated until the elder line ended in an heiress, io. Edw. III., traced their descent from Gerneber, a noble Saxon, \vho possessed large tracts of land before the Conquest. B.L.G.
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