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Last name Ieng (អៀង , Ieng , イエン ) , all over the world, is a common family name. The family name Ieng is habitual in Cambodia, where it is a common surname, Macao, where it is quite a common surname, and Taiwan. In absolute terms, the name is most common in Cambodia, Taiwan, and the United Kingdom. Very seldom, Ieng is the forename as well as the last name.