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Cognomen Kathir (Kathir , كثير , Касир ) , around the globe, is quite a common last name. The surname Kathir is habitual in Sri Lanka, where it is quite a rare surname, Oman, and Qatar. Not in comparison with a country's population, this name is the most popular in Southern Asia, particularly India, Iran, and Sri Lanka. Also, Kathir is the forename as well as the last name.