Surname Siangphloen (Siangphloen 
) , throughout the world, is a very rare cognomen. The cognomen Siangphloen is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Siangphloen | Thailand |
Prew, Praew, and Phatharachanok