Family name ถอย (Thoi 
, ថយ 
, Retree 
) , in the entire world, is quite a rare cognomen. The surname ถอย is habitual in South-eastern Asia, particularly Cambodia, where it is quite a rare surname, Singapore, where it is a rare surname, and Vietnam. Measured by absolute frequency, this name is the most popular in India, Vietnam, and Myanmar. Likewise, ถอย is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Thoi | Myanmar, Vietnam, United States, India, Malaysia |
| ថយ | Cambodia |
| ถอย, Retree | Thailand |