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Family name Matsui (マツイ , Matsui , 松井 , and others...) , around the world, is quite a common surname. The cognomen Matsui is characteristic of Singapore, where it is quite a rare surname, Japan, and Hong Kong, where it is a rare surname. Not in comparison with a country's population, it is commonest in Japan, Brazil, and the United States. More frequently, Matsui is the forename as well as the last name.