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Last name 金井 (Kanai , 金井 , Канаи ) , in the entire world, is quite a rare cognomen. The family name 金井 is characteristic of Hungary, where it is quite a rare surname, Kenya, and Saudi Arabia, where it is a rare surname. Measured by absolute frequency, the name is most common in India, Kenya, and Japan. Much more frequently, 金井 is the forename as well as the last name.