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Cognomen オカダ (オカダ , Okada , Kazuchika ) , across the world, is a common family name. The cognomen オカダ is characteristic of Guam, where it is quite a common surname, Cayman Islands, and Paraguay, where it is quite a rare surname. Measured by absolute frequency, it is commonest in Japan, Brazil, and the United States. More frequently, オカダ is the forename as well as the last name.