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Cognomen Thái (Thai , Thái , 蔡 ) , around the world, is a prevalent family name. The surname Thái is habitual in China, where it is a common surname, Malaysia, where it is quite a common surname, and Lesotho (explore the name in all countries). In absolute terms, the name is most common in China, Vietnam, and Malaysia. Much less frequently, Thái is the forename as well as the last name.