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Surname Кога (Koga , 古河 , 古家 ) , in all the world, is quite a common family name. The last name Кога is habitual in Paraguay, where it is quite a rare surname, Zimbabwe, and Luxembourg. Not in comparison with a country's population, it is the most numerous in Brazil, the United States, and Japan. Very seldom, Кога is the forename as well as the last name.