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Last name 玉井 (Tamai , 玉井 , Таманои ) , all over the world, is quite a rare cognomen. The surname 玉井 is habitual in Belize, where it is quite a common surname, Papua New Guinea, where it is quite a rare surname, and Italy. In absolute terms, it is the most numerous in India, Italy, and Papua New Guinea. Likewise, 玉井 is the forename as well as the last name.