Lower, Mark A (1860) Patronymica Britannica: a dictionary of the family names of the United Kingdom. London: J.R. Smith. Public Domain.
TOPP
As described in historical dictionaries
Patronymica Britannica (1860)
TOPP. An elevated spot is known iu some dialects as a tojf, and is used antithetically to bottom, wliich see. Residence on such a spot would originate the surname.
Origin: English
Region of origin: British Isles
Country of origin: England
Religion of origin: Christian
Language of origin: English