Family name Ratnaa (Ratnaa 
) , globally, is a rare cognomen. The family name Ratnaa is habitual in South-eastern Asia, particularly Singapore, where it is a rare surname, Indonesia, where it is a very rare surname, and Malaysia, where it is an extremely rare surname. Measured by absolute frequency, this name is the most popular in Indonesia, Singapore, and India. Likewise, Ratnaa is the forename as well as the last name.