Cognomen Ranmuthu (Ranmuthu 
) , all over the world, is a rare last name. The last name Ranmuthu is characteristic of Sri Lanka, where it is quite a rare surname, the United Kingdom, where it is an extremely rare surname, and the United States. Also, Ranmuthu is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Ranmuthu | United Kingdom, United States, Sri Lanka |