Family name Owatjumrus (Owatjumrus 
) , worldwide, is a very rare cognomen. The cognomen Owatjumrus is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Owatjumrus | Thailand |
Yaowalak, Chonpakorn, and Pimchanok