Surname ดาช (Dat 
, ดาช 
) , in all the world, is a common family name. The cognomen ดาช is habitual in Aland Islands, where it is quite a common surname, Vietnam, where it is quite a rare surname, and Bahamas. In absolute terms, it most frequently occurs in India, Vietnam, and Malaysia. Also, ดาช is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Dat | Myanmar, Vietnam, United States, India, Malaysia |
| ดาช | Thailand |