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Last name Taniguchi (タニグチ , Taniguchi , 朋子 ) , globally, is quite a common surname. The cognomen Taniguchi is characteristic of Fiji, where it is quite a common surname, Japan, where it is quite a rare surname, and Taiwan, where it is a rare surname. In absolute terms, it most frequently occurs in Japan, Brazil, and the United States. More frequently, Taniguchi is the forename as well as the last name.