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Surname Joka (Joka , Йока ) , in the world, is a common cognomen. The cognomen Joka is characteristic of Japan, where it is quite a common surname, Serbia, where it is quite a rare surname, and Croatia. Not in comparison with a country's population, the name is most common in Japan, India, and South Africa. Much less frequently, Joka is the forename as well as the last name.