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 | Myanmar, Vietnam, France, Mongolia, Malaysia |
| Works | Vietnam, United States, India, Indonesia, Malaysia |
| ธิ | Thailand |
| Thyti | Brazil |