Lower, Mark A (1860) Patronymica Britannica: a dictionary of the family names of the United Kingdom. London: J.R. Smith. Public Domain.
CAPP
As described in historical dictionaries
Patronymica Britannica (1860)
CAPP. CAPPS. Probably borrowed from that article of costume. See under Quaife, I\Iantell, Freemantle, &c. &c.
Origin: English
Region of origin: British Isles
Country of origin: England
Religion of origin: Christian
Language of origin: English