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Surname Kalmus (Kalmus , Кальмус ) , around the world, is quite a rare cognomen. The last name Kalmus is characteristic of Estonia, where it is quite a common surname, Luxembourg, where it is quite a rare surname, and Czechia. Measured by absolute frequency, this name is the most popular in the United States, Ukraine, and Estonia. Much less frequently, Kalmus is the forename as well as the last name.