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Last name Khairuddin (Khairuddin , Хаируддин , Хайреддин ) , around the globe, is a common surname. The last name Khairuddin is habitual in South-eastern Asia, particularly Malaysia, where it is quite a common surname, Brunei, and Singapore, where it is quite a rare surname. Measured by absolute frequency, it is the most numerous in Malaysia, Indonesia, and India. Also, Khairuddin is the forename as well as the last name.