Surname จัย (Chai 
, Shai , จัย 
) , throughout the world, is a widespread last name. The surname จัย is habitual in Malaysia, where it is a common surname, British Virgin Islands, and Singapore (explore the name in all countries). In absolute terms, it is the most numerous in China, Malaysia, and Indonesia. Much less frequently, จัย is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Shai, Chai | China, Myanmar, South Africa, Indonesia, Malaysia |
| จัย | Thailand |