Family name คอยด์ (Khoi 
, คอยด์ 
) , in the entire world, is quite a rare surname. The cognomen คอยด์ is habitual in Malaysia, where it is quite a rare surname, Vietnam, and Taiwan, where it is a rare surname. Measured by absolute frequency, it is the most numerous in South-eastern Asia, particularly Vietnam, Malaysia, and Indonesia. More frequently, คอยด์ is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Khoi | Vietnam, United States, India, Indonesia, Malaysia |
| คอยด์ | Thailand |