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Cognomen Kosir (Kosir , Košir ) , around the globe, is quite a rare last name. The cognomen Kosir is characteristic of Southern Europe, particularly Slovenia, where it is a common surname, Croatia, where it is quite a rare surname, and Bosnia and Herzegovina. Measured by absolute frequency, this name is the most popular in Slovenia, Croatia, and Pakistan. Very seldom, Kosir is the forename as well as the last name.