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Last name カズヤ (Kazuya , カズヤ ) , in all the world, is a common family name. The last name カズヤ is habitual in Japan, where it is quite a common surname, Indonesia, where it is a rare surname, and Singapore. Not in comparison with a country's population, it is commonest in Japan, Indonesia, and China. Very seldom, カズヤ is the forename as well as the last name.