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Last name Jahani (Jahani , جهاني , Джахани ) , in the world, is a common cognomen. The cognomen Jahani is characteristic of Iran, where it is quite a common surname, Afghanistan, where it is quite a rare surname, and Libya. Not in comparison with a country's population, this name is the most popular in Iran, Afghanistan, and Malaysia. Much less frequently, Jahani is the forename as well as the last name.