Cognomen ไคร (Khairak 
, ไคร , Khrai 
) , worldwide, is a rare last name. The family name ไคร is habitual in Thailand, where it is a rare surname, and India, where it is an extremely rare surname. Much less frequently, ไคร is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Khairak | India, Thailand |
| ไคร | Thailand |
| Khrai | India, United States, Thailand |