Last name سیروس (Sirous 
, Sirus 
, سیروس ) , worldwide, is a rare cognomen. The cognomen سیروس is characteristic of Iran, where it is a rare surname, Romania, and Malaysia, where it is a very rare surname. Measured by absolute frequency, the name is most common in Indonesia, Iran, and the United States. More prevalently, سیروس is the forename as well as the last name.