Family name ค่อย (Khoi 
, ค่อย) , across the world, is quite a rare cognomen. The last name ค่อย is characteristic of 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, ค่อย is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Khoi | Vietnam, United States, India, Indonesia, Malaysia |