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Cognomen Jiro (Jiro , ワン , جيرو ) , all around the world, is quite a common family name. The surname Jiro is characteristic of Japan, where it is quite a rare surname, Zimbabwe, and Syria, where it is a rare surname. Measured by absolute frequency, it is the most numerous in Japan, China, and Indonesia. Likewise, Jiro is the forename as well as the last name.