Family name Unnawetwanich (Unnawetwanich 
) , in the entire world, is a very rare last name. The cognomen Unnawetwanich is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Unnawetwanich | Thailand |
Ruchnida, Ruchwiboon, Ruchchawalun, and Tithipat