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Surname 武井 (Takei , 武井 , Буи ) , in all the world, is quite a rare last name. The cognomen 武井 is habitual in Switzerland, where it is quite a rare surname, Hong Kong, where it is a rare surname, and Japan. Measured by absolute frequency, it is the most numerous in Japan, Brazil, and Indonesia. Much less frequently, 武井 is the forename as well as the last name.