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Family name 夏井 (Natsui , 夏井 , Нацуи ) , around the world, is a very rare cognomen. The cognomen 夏井 is habitual in Brazil, where it is an extremely rare surname, Nigeria, and the United States. Not in comparison with a country's population, it is commonest in Brazil, China, and the United States. Much more prevalently, 夏井 is the forename as well as the last name.