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Surname 堺 (Sakai , 堺 , Сакаи ) , in all the world, is a common family name. The surname 堺 is characteristic of Singapore, where it is quite a rare surname, Japan, and Hong Kong. Not in comparison with a country's population, it is the most numerous in Japan, Brazil, and the United States. Very seldom, 堺 is the forename as well as the last name.