Family name Samarnkatiwat (Samarnkatiwat 
) , in all the world, is a very rare surname. The last name Samarnkatiwat is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Samarnkatiwat | Thailand |
Nitipat, Theerayut, and Natchariya