Last name ซ้าย (Sai 
, Lext 
, ซ้าย) , in the entire world, is a widespread surname. The surname ซ้าย is habitual in 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, it is commonest in Myanmar, India, and Mongolia. More frequently, ซ้าย is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Sai | Malaysia, China, India, Mongolia, Myanmar |
| Lext | Georgia, United States |
| Lefret | France |