Last name ยาส (Yat 
, ยาส 
) , in the world, is a common cognomen. The surname ยาส is characteristic of Guatemala, where it is quite a common surname, Hong Kong, where it is quite a rare surname, and Malaysia. Measured by absolute frequency, the name is most common in Guatemala, Indonesia, and Malaysia. Much less frequently, ยาส is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Yat | Indonesia, Taiwan, China, Malaysia, Guatemala |
| ยาส | Thailand |