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Last name Alsn (السن , Alsn , الصن ) , all over the world, is quite a rare cognomen. The cognomen Alsn is habitual in Western Asia, particularly Palestinian Territory, where it is quite a rare surname, Syria, and Lebanon, where it is a rare surname. Measured by absolute frequency, it is the most numerous in Egypt, Syria, and Palestinian Territory. Also, Alsn is the forename as well as the last name.