Family name สมุหวัฒนชัย (สมุหวัฒนชัย 
) , all around the world, is an extremely rare cognomen. The surname สมุหวัฒนชัย is characteristic of South-eastern Asia, particularly Thailand, where it is an extremely rare surname.
| VARIANT | COUNTRY |
|---|---|
| สมุหวัฒนชัย | Thailand |