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Family name いしはら (Ishihara , Tadaoki , いしはら) , across the world, is quite a rare cognomen. The last name いしはら is habitual in Japan, where it is a rare surname, Lithuania, and Singapore. Measured by absolute frequency, it is the most numerous in Japan, the United States, and Brazil. Likewise, いしはら is the forename as well as the last name.