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Cognomen Phasai (Phasai
, สพสมัย
, ฟ้าใส) , globally, is a very rare last name. The cognomen Phasai is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname. Likewise, Phasai is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Phasai | India, Thailand |
| พลาสัย, สพสมัย | Thailand |
Wangsa, Peraworasakul, Yensurin, Phiraworasakun, and Rattanaburee