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Surname Tahhan (Tahhan ) , throughout the world, is quite a common last name. The cognomen Tahhan is habitual in Western Asia, particularly Syria, where it is quite a common surname, Lebanon, where it is quite a rare surname, and United Arab Emirates. Not in comparison with a country's population, the name is most common in Syria, Lebanon, and Egypt. Much less frequently, Tahhan is the forename as well as the last name.