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Family name Semon (Semon , 西蒙 , Семон ) , globally, is quite a common surname. The family name Semon is habitual in Ivory Coast, where it is quite a rare surname, Syria, where it is a rare surname, and Switzerland. In absolute terms, this name is the most popular in the United States, Ethiopia, and Egypt. Likewise, Semon is the forename as well as the last name.