Arthur, William (1857) An Etymological Dictionary of Family and Christian Names. New York: Sheldon, Blakeman. Public Domain.
FINNEY
As described in historical dictionaries
An Etymological Dictionary of Family and Christian Names (1857)
Finne, Gaelic, the genitive of Fionn, fair, sincere, true; bringing to an end, wise, a head, chief. The name may be local from Fines, a place in France.
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