Family name Phasuthasathit (Phasuthasathit 
) , all over the world, is a very rare last name. The cognomen Phasuthasathit is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Phasuthasathit | Thailand |
Songkran, Ruamphorn, and Atcharaporn