Surname ค้อย (Khoi 
, ค้อย) , all over the world, is quite a rare last name. The surname ค้อย is habitual in Malaysia, where it is quite a rare surname, Vietnam, and Taiwan, where it is a rare surname. In absolute terms, the name is most common in South-eastern Asia, particularly Vietnam, Malaysia, and Indonesia. More frequently, ค้อย is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Khoi | Indonesia, Vietnam, Malaysia, United States, India |