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Last name Saifuddin (Saifuddin , Сайфутдин , ซัยฟุดดีน ) , in the world, is a common cognomen. The cognomen Saifuddin is habitual in Brunei, where it is quite a common surname, Malaysia, where it is quite a rare surname, and United Arab Emirates. Measured by absolute frequency, it most frequently occurs in Indonesia, Bangladesh, and Malaysia. More prevalently, Saifuddin is the forename as well as the last name.