Cognomen ส่วย (Suai 
, 稅 
, ส่วย) , in all the world, is quite a rare family name. The family name ส่วย is characteristic of South-eastern Asia, particularly Malaysia, where it is quite a rare surname, Myanmar, where it is a rare surname, and Indonesia, where it is a very rare surname. Measured by absolute frequency, it most frequently occurs in India, Malaysia, and Indonesia. Likewise, ส่วย is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Suai | Myanmar, Thailand, India, Indonesia, Malaysia |
| 稅 | China |