Family name موسن (Musen 
, موسن) , globally, is a rare cognomen. The last name موسن is habitual in Bulgaria, where it is quite a rare surname, Denmark, where it is a rare surname, and Malaysia, where it is a very rare surname. Measured by absolute frequency, this name is the most popular in Ethiopia, Bulgaria, and the United States. More frequently, موسن is the forename as well as the last name.