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Cognomen Giap (Giap , Giáp , جياب ) , in all the world, is a common surname. The cognomen Giap is habitual in Malaysia, where it is quite a common surname, Macao, where it is quite a rare surname, and Vietnam. In absolute terms, the name is most common in Malaysia, Vietnam, and Jordan. Very seldom, Giap is the forename as well as the last name.