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Surname Imai (イマイ , Imai , Имай , along with others...) , throughout the world, is quite a common cognomen. The last name Imai is characteristic of Taiwan, where it is quite a rare surname, Japan, and Singapore, where it is a rare surname. In absolute terms, it most frequently occurs in Japan, Brazil, and the United States. More frequently, Imai is the forename as well as the last name.