Arthur, William (1857) An Etymological Dictionary of Family and Christian Names. New York: Sheldon, Blakeman. Public Domain.
MORTON
As described in historical dictionaries
An Etymological Dictionary of Family and Christian Names (1857)
(origin: Gaelic. Local) From the parish of Morton, in Nithsdale, Dumfriesshire, Scotland. Mor, big, great, and dun, ton, a hill.
Patronymica Britannica (1860)
MORTON. Parishes and places in cos. Derby, Lincoln, York, Warwick, Durham, Norfolk, Hereford, Northampton, &c.
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