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Last name 肅 (숙 , Sù , 肅 ) , in all the world, is a rare cognomen. The cognomen 肅 is characteristic of Myanmar, where it is a very rare surname, Vietnam, and Italy. Not in comparison with a country's population, it is commonest in China, Myanmar, and Vietnam. Much more prevalently, 肅 is the forename as well as the last name.