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Family name Khamsin (خمسين , Khamsin , คำสิน) , all around the world, is quite a rare cognomen. The cognomen Khamsin is habitual in Oman, where it is quite a rare surname, Sudan, and Libya, where it is a rare surname. In absolute terms, it most frequently occurs in Sudan, Tanzania, and Oman. Much less frequently, Khamsin is the forename as well as the last name.