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Family name Okada (オカダ , Okada , Окада ) , in all the world, is a common last name. The cognomen Okada 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, the name is most common in Japan, Brazil, and the United States. More frequently, Okada is the forename as well as the last name.