Family name วิริยดิลกธรรม (วิริยดิลกธรรม 
) , around the globe, is an extremely rare last name. The last name วิริยดิลกธรรม is characteristic of South-eastern Asia, particularly Thailand, where it is an extremely rare surname.
| VARIANT | COUNTRY |
|---|---|
| วิริยดิลกธรรม | Thailand |