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Cognomen Cus (Cus , カス ) , in the entire world, is quite a rare surname. The last name Cus is habitual in Belize, where it is quite a common surname, Slovenia, and Serbia, where it is quite a rare surname. Not in comparison with a country's population, this name is the most popular in Indonesia, Myanmar, and Slovenia. Much less frequently, Cus is the forename as well as the last name.