Arthur, William (1857) An Etymological Dictionary of Family and Christian Names. New York: Sheldon, Blakeman. Public Domain.
SETON
As described in historical dictionaries
An Etymological Dictionary of Family and Christian Names (1857)
(origin: Local) From lands of that name in Haddingtonshire, Scotland, which were so called because the town thereof was situated close upon the sea, and which gave name to the family of Seton, so renowned in Scottish annals.
Patronymica Britannica (1860)
SETON. From a curious M.S. genealogy
Lower, Mark A (1860) Patronymica Britannica: a dictionary of the family names of the United Kingdom. London: J.R. Smith. Public Domain.
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