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Family name Koger (Koger , Koker , Когер ) , globally, is quite a common cognomen. The surname Koger is characteristic of Estonia, where it is quite a common surname, Sierra Leone, where it is quite a rare surname, and Namibia. Measured by absolute frequency, the name is most common in the United States, Sierra Leone, and Estonia. Very seldom, Koger is the forename as well as the last name.