Family name Riyai (Riyai 
) , around the world, is a very rare cognomen. The cognomen Riyai is habitual in Thailand, where it is a very rare surname, Malaysia, where it is an extremely rare surname, and India. Much less frequently, Riyai is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Riyai | Malaysia, India, Thailand |