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Surname Касс (Cass , Kass , Касс ) , in all the world, is a common family name. The last name Касс is characteristic of Curacao, where it is quite a common surname, Estonia, and Luxembourg (explore the name in all countries). Measured by absolute frequency, this name is the most popular in the United States, the United Kingdom, and Australia. Very seldom, Касс is the forename as well as the last name.