Arthur, William (1857) An Etymological Dictionary of Family and Christian Names. New York: Sheldon, Blakeman. Public Domain.
CLAPP
As described in historical dictionaries
An Etymological Dictionary of Family and Christian Names (1857)
(origin: Cor. Br.) Full of chat, tonguey; from the Cornish-British clap, prating.
Patronymica Britannica (1860)
CLAPP. An early Danish surname. Osgod Clapa was a Danisli noble at the court of Canute. From him it is supposed
Lower, Mark A (1860) Patronymica Britannica: a dictionary of the family names of the United Kingdom. London: J.R. Smith. Public Domain.
Origin: English
Region of origin: British Isles
Country of origin: England
Religion of origin: Christian
Language of origin: English