(Welsh.) Local. From lorn, bare, naked, exposed, and maes, a field, a name of place—the place in the open field.
Arthur, William (1857) An Etymological Dictionary of Family and Christian Names. New York: Sheldon, Blakeman. Public Domain.
LOOMIS
As described in historical dictionaries
An Etymological Dictionary of Family and Christian Names (1857)
(Welsh.) Local. From lorn, bare, naked, exposed, and maes, a field, a name of place—the place in the open field.