Family name Riyotha (Riyotha 
) , in the world, is a very rare last name. The family name Riyotha is characteristic of South-eastern Asia, particularly Singapore, where it is a rare surname, and Thailand, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Riyotha | Singapore, Thailand |
Audom, Napawan, and Suphawadee