Cognomen วิริยะวัทธา (วิริยะวัทธา 
) , in the entire world, is an extremely rare last name. The surname วิริยะวัทธา is habitual in South-eastern Asia, particularly Thailand, where it is an extremely rare surname.
| VARIANT | COUNTRY |
|---|---|
| วิริยะวัทธา | Thailand |