Cognomen อุดมสมุทรหิรัญ (อุดมสมุทรหิรัญ 
) , in the entire world, is a very rare family name. The family name อุดมสมุทรหิรัญ is characteristic of South-eastern Asia, particularly Thailand, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| อุดมสมุทรหิรัญ | Thailand |