Cognomen Rowsan (Rowsan 
) , in all the world, is a rare last name. The cognomen Rowsan is habitual in Bangladesh, where it is a rare surname, Saudi Arabia, where it is a very rare surname, and Malaysia, where it is an extremely rare surname. In absolute terms, this name is the most popular in Bangladesh, Saudi Arabia, and India. More prevalently, Rowsan is the forename as well as the last name.