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Family name Nakai (ナカイ , Nakai , Накай ) , all over the world, is quite a rare cognomen. The last name Nakai is characteristic of Tunisia, where it is quite a rare surname, Jamaica, and Japan, where it is a rare surname. Measured by absolute frequency, this name is the most popular in Japan, the United States, and Brazil. More frequently, Nakai is the forename as well as the last name.