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The name is a tautology, consisting of the word "loch" (of Gaelic origin) and vatn, a Norse word meaning the very same, found in such names as "Þingvallavatn" and Myvatn in Iceland, and "Røssvatnet" and "Møsvatn" in Norway.
Gaelic first names chiefly hail from 5 linguistic layers, Goidelic and 4 others, coinciding with the main languages of contact: Latin, Norse, Anglo-Norman and Scots.