Last name ดุย (Dui 
, ดุย 
) , around the globe, is quite a common cognomen. The surname ดุย is characteristic of Taiwan, where it is quite a common surname, Malaysia, where it is quite a rare surname, and Italy, where it is a rare surname. Not in comparison with a country's population, it is commonest in Taiwan, India, and China. Likewise, ดุย is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Dui | Malaysia, China, Indonesia, India, Taiwan |
| ดุย | Thailand |