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Surname Kaiwen (凯文 , 开文 , Kaiwen ) , around the world, is quite a common cognomen. The family name Kaiwen is habitual in Taiwan, where it is a rare surname, Singapore, and China. Not in comparison with a country's population, it is commonest in China, Taiwan, and Malaysia. More frequently, Kaiwen is the forename as well as the last name.