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Last name Liên (Lien , Liên ) , throughout the world, is a common surname. The cognomen Liên is characteristic of Norway, where it is a common surname, Vietnam, where it is quite a common surname, and Macao (explore the name in all countries). In absolute terms, it is commonest in Vietnam, Malaysia, and Norway. Much less frequently, Liên is the forename as well as the last name.