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Surname Yên (Yen , Yên , 圓 ) , across the world, is a widespread last name. The family name Yên is characteristic of Malaysia, where it is a common surname, Taiwan, where it is quite a common surname, and Bermuda (explore the name in all countries). Measured by absolute frequency, it is commonest in Malaysia, Vietnam, and Taiwan. Much less frequently, Yên is the forename as well as the last name.