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Family name Koza (Koza , Koss , Коза ) , in the world, is a common cognomen. The last name Koza is characteristic of Japan, where it is quite a common surname, Poland, where it is quite a rare surname, and Slovakia. In absolute terms, the name is most common in Japan, the United States, and Poland. Very seldom, Koza is the forename as well as the last name.