Last name Siouzan (Сюзан 
, Siouzan 
) , all over the world, is a very rare surname. The last name Siouzan is habitual in Armenia, where it is quite a rare surname, Bulgaria, where it is a rare surname, and Ukraine, where it is an extremely rare surname. Not in comparison with a country's population, it is the most numerous in Armenia, Bulgaria, and Russia. More prevalently, Siouzan is the forename as well as the last name.