Surname สัย (Sai 
, สัย 
) , in all the world, is a widespread family name. The family name สัย is characteristic of Mongolia, where it is a prevalent surname, Myanmar, where it is a common surname, and Malaysia, where it is quite a common surname (explore the name in all countries). Measured by absolute frequency, this name is the most popular in Myanmar, India, and Mongolia. More frequently, สัย is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Sai | Malaysia, China, India, Mongolia, Myanmar |
| สัย | Thailand |