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Family name Когер (Koger , Когер ) , in all the world, is quite a rare last name. The cognomen Когер is characteristic of Estonia, where it is quite a common surname, Malta, where it is quite a rare surname, and Hungary. Not in comparison with a country's population, it is commonest in the United States, Estonia, and Germany. Very seldom, Когер is the forename as well as the last name.