Surname Runchaya (Runchaya 
) , across the world, is an extremely rare family name. Predominantly, Runchaya is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Runchaya | Thailand |
Ruangrudee, Nuekchaiyapom, Nuekchaiyapum, Sitthiyod, and Nithiwirun