Family name Yiamwanitnan (Yiamwanitnan 
) , in all the world, is a very rare surname. The cognomen Yiamwanitnan is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Yiamwanitnan | Thailand |
Sunan, Prayot, Thanaporn, and Phinyaphat