Cognomen Dayanthi (Dayanthi 
) , globally, is a rare family name. The cognomen Dayanthi is habitual in Indonesia, where it is a very rare surname, and India, where it is an extremely rare surname. Also, Dayanthi is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Dayanthi | Australia, India, Sri Lanka, United States, Indonesia |