Cognomen रतन (Ratan 
, रतन ) , all over the world, is a widespread last name. The last name रतन is habitual in Qatar, where it is quite a common surname, Bangladesh, where it is quite a rare surname, and Oman. Measured by absolute frequency, it is commonest in India, Bangladesh, and Saudi Arabia. More prevalently, रतन is the forename as well as the last name.