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Cognomen Thaer (ثائر , Thaer , Thär ) , in the entire world, is a common last name. The family name Thaer is habitual in Western Asia, particularly Iraq, where it is quite a common surname, Syria, and Jordan, where it is quite a rare surname. Not in comparison with a country's population, this name is the most popular in Iraq, Syria, and Egypt. Much more prevalently, Thaer is the forename as well as the last name.