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Family name Rehmani (Rehmani , رحمانی ) , around the world, is a common cognomen. The cognomen Rehmani is habitual in Afghanistan, where it is quite a common surname, United Arab Emirates, where it is quite a rare surname, and Oman. Not in comparison with a country's population, it is commonest in Southern Asia, particularly Afghanistan, Pakistan, and India. Much less frequently, Rehmani is the forename as well as the last name.