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Family name Koker (Koger , Koker , Кокер ) , in the entire world, is quite a common last name. The family name Koker is characteristic of Estonia, where it is quite a common surname, Sierra Leone, where it is quite a rare surname, and Namibia. Not in comparison with a country's population, it is the most numerous in the United States, Sierra Leone, and Estonia. Very seldom, Koker is the forename as well as the last name.