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Last name Kosari (Kosari , کوثری , كوثري ) , all around the world, is quite a common family name. The family name Kosari is habitual in Iran, where it is quite a rare surname, Slovakia, where it is a rare surname, and Hong Kong. In absolute terms, it is commonest in Iran, India, and Indonesia. Very seldom, Kosari is the forename as well as the last name.