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Family name 中井 (Nakai
, 中井
, Накаи
) , in the entire world, is quite a rare surname. The cognomen 中井 is habitual in Tunisia, where it is quite a rare surname, Jamaica, and Japan, where it is a rare surname. Measured by absolute frequency, the name is most common in the United States, Japan, and Brazil. Also, 中井 is the forename as well as the last name.