Family name คาส (Khat 
, คาส 
) , across the world, is a common cognomen. The last name คาส is habitual in Myanmar, where it is quite a common surname, Kuwait, where it is a rare surname, and Lebanon. Not in comparison with a country's population, the name is most common in Myanmar, India, and Pakistan. Likewise, คาส is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Khat | Myanmar, Morocco, Pakistan, India, Malaysia |
| คาส | Thailand |