Cognomen פירדוסי (Ferdowsi 
, פירדוסי 
) , around the world, is quite a rare last name. The cognomen פירדוסי is habitual in Bangladesh, where it is a rare surname, Iran, and Belgium. Measured by absolute frequency, it is the most numerous in Bangladesh, Iran, and the United States. Likewise, פירדוסי is the forename as well as the last name.