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Family name Dasai (Dasai , 大赛 ) , throughout the world, is a widespread surname. The family name Dasai is habitual in India, where it is quite a common surname, Suriname, and Thailand, where it is a very rare surname. Measured by absolute frequency, this name is the most popular in India, China, and Suriname. Much less frequently, Dasai is the forename as well as the last name.