Cognomen ธิ (Thi 
, Works 
, ธิ 
) , in the world, is a widespread family name. The family name ธิ is characteristic of Mongolia, where it is a common surname, Myanmar, and Vietnam, where it is quite a common surname (explore the name in all countries). Also, ธิ is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Thi | Mongolia, Myanmar, Malaysia, France, Vietnam |
| Works | Malaysia, India, Vietnam, Indonesia, United States |
| ธิ | Thailand |
| Thyti | Brazil |