CUSICK

Kessoch, a town near the Moray Frith, Scotland; casach, Gaelic, an ascent going up by steps. Casag, in Gaelic, signifies a long coat or cassock, formerly a cloak or gown worn by the clergy over the other garments. The name may be local, from the place, or from the peculiar dress worn by the individual.

Arthur, William (1857) An Etymological Dictionary of Family and Christian Names. New York: Sheldon, Blakeman. Public Domain.