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Surname Gassan (غسان , Gassan , גסאן ) , all over the world, is a common cognomen. The surname Gassan is characteristic of Western Asia, particularly Syria, where it is quite a common surname, Iraq, and Lebanon, where it is quite a rare surname. Not in comparison with a country's population, it is commonest in Japan, Iraq, and Syria. More prevalently, Gassan is the forename as well as the last name.