Cognomen Ramnathan (Ramnathan 
) , in the world, is quite a rare surname. The surname Ramnathan is characteristic of Singapore, where it is a rare surname, India, where it is a very rare surname, and Canada. In absolute terms, this name is the most popular in India, China, and Singapore. Likewise, Ramnathan is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Ramnathan | China, Singapore, United States, India, Canada |