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Surname Kallas (Kallas , كلاس , Калас ) , around the world, is a common cognomen. The surname Kallas is habitual in Estonia, where it is a common surname, Lebanon, where it is quite a common surname, and Syria. Not in comparison with a country's population, it most frequently occurs in Lebanon, Syria, and the United States. Very seldom, Kallas is the forename as well as the last name.