Family name กะลาสี (Kelasi 
, Kalasi 
, Pailor 
) , throughout the world, is quite a rare surname. The family name กะลาสี is habitual in Botswana, where it is quite a rare surname, Bulgaria, where it is a rare surname, and Tanzania. Measured by absolute frequency, the name is most common in India, the Democratic Republic of the Congo, and Tanzania. More frequently, กะลาสี is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Kelasi | Myanmar, Malaysia, India, China, France |
| Kalasi | Botswana, Tanzania, Indonesia, Democratic Republic of the Congo, India |
| Pailor | United Kingdom, Canada, India, United States |
| กะลาสี | Thailand |