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Family name Naito (ナイトウ , Naito , Наито ) , throughout the world, is quite a rare last name. The cognomen Naito is characteristic of Hong Kong, where it is quite a rare surname, Japan, where it is a rare surname, and Kenya. Measured by absolute frequency, it is commonest in Japan, the United States, and Kenya. More frequently, Naito is the forename as well as the last name.