Family name Phaensuwan (Phaensuwan 
) , in the world, is a very rare surname. The cognomen Phaensuwan is habitual in Thailand, where it is a very rare surname, and Switzerland.
| VARIANT | COUNTRY |
|---|---|
| Phaensuwan | Switzerland, Thailand |
Anucha, Khrueawan, Ruthairat, Sutthiphong, and Atcharaporn