Arthur, William (1857) An Etymological Dictionary of Family and Christian Names. New York: Sheldon, Blakeman. Public Domain.
HAMLIN
As described in historical dictionaries
An Etymological Dictionary of Family and Christian Names (1857)
(origin: Local) A corruption of Hammeline, which was taken from Hamelen, a town on the river Weser, Germany. Hamelin, a town in Scotland, so called from Ham, a house or village, and lin, a waterfall, a small lake or pond.
Patronymica Britannica (1860)
HAMLIN. HAMLING. See Hamlyn.
Lower, Mark A (1860) Patronymica Britannica: a dictionary of the family names of the United Kingdom. London: J.R. Smith. Public Domain.
Surname type: Diminutive
Origin: English
Region of origin: British Isles
Country of origin: England
Religion of origin: Christian
Language of origin: English