Surname สุทธ์ (Sut 
, สุทธ์ 
) , around the globe, is a common last name. The surname สุทธ์ is characteristic of Myanmar, where it is quite a rare surname, Guatemala, and Macao. Measured by absolute frequency, it most frequently occurs in Myanmar, India, and Guatemala. Likewise, สุทธ์ is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Sut | Guatemala, Indonesia, India, Myanmar, Poland |
| สุทธ์ | Thailand |