Lower, Mark A (1860) Patronymica Britannica: a dictionary of the family names of the United Kingdom. London: J.R. Smith. Public Domain.
LOCH
As described in historical dictionaries
Patronymica Britannica (1860)
LOCH. A Celtic word, implying sometimes a lake, and sometimes an arm of the sea, or asstuary.
Origin: Celtic
Region of origin: British Isles
Country of origin: Scotland
Religion of origin: Christian
Language of origin: Gaelic