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Family name Nishio (ニシオ , Nishio , 大介 ) , all over the world, is quite a rare cognomen. The surname Nishio is characteristic of Hong Kong, where it is quite a rare surname, Taiwan, where it is a rare surname, and Sri Lanka. Measured by absolute frequency, the name is most common in Japan, Brazil, and the United States. More frequently, Nishio is the forename as well as the last name.