Family name แสงไว (Sangwai 
, แสงไว , Saengwai ) , around the world, is a rare surname. The family name แสงไว is habitual in Thailand, where it is a very rare surname, India, and South Africa, where it is an extremely rare surname. Measured by absolute frequency, the name is most common in India, Thailand, and Nigeria. Likewise, แสงไว is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Sangwai | United States, India, South Africa, Thailand, Nigeria |
| Saengwai, แสงไว | Thailand |