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Surname Haeng (Haeng , แฮงค์ส , แฮงค์ ) , all over the world, is a rare cognomen. The family name Haeng is habitual in Estonia, where it is a rare surname, South Korea, and Malaysia. In absolute terms, it is commonest in South Korea, Indonesia, and Malaysia. More prevalently, Haeng is the forename as well as the last name.