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Cognomen Даи (Dai , 室 , Даи ) , in the world, is a prevalent surname. The last name Даи is habitual in Cayman Islands, where it is a common surname, Bermuda, where it is quite a common surname, and China (explore the name in all countries). In absolute terms, the name is most common in China, India, and Indonesia. Very seldom, Даи is the forename as well as the last name.