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Surname Thảo (Thảo , タオ , Тхао ) , throughout the world, is a widespread last name. The cognomen Thảo is characteristic of Vietnam, where it is a common surname, Macao, where it is quite a rare surname, and Japan, where it is a rare surname. In absolute terms, it most frequently occurs in Vietnam, Japan, and Taiwan. Very seldom, Thảo is the forename as well as the last name.