Cognomen Ridhar (Ridhar 
) , in the entire world, is a very rare last name. The cognomen Ridhar is habitual in Indonesia, where it is a very rare surname, China, where it is an extremely rare surname, and India. More prevalently, Ridhar is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Ridhar | India, Indonesia, South Africa, China |