Family name Ratnasothy (Ratnasothy 
) , globally, is a rare cognomen. The family name Ratnasothy is characteristic of Sri Lanka, where it is a rare surname, Australia, where it is a very rare surname, and the United Kingdom. Much less frequently, Ratnasothy is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Ratnasothy | United Kingdom, Australia, United States, Sri Lanka, Canada |
| ratnasothy saravanamuttu Ceylon Tamil physician and politician (b. 1886) |
|