Cognomen ไห (Hai 
, ไห 
) , in the entire world, is a widespread family name. The surname ไห is characteristic of Malaysia, where it is quite a common surname, Macao, and Israel (explore the name in all countries). Measured by absolute frequency, it most frequently occurs in China, Malaysia, and Vietnam. Also, ไห is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Hai | Bangladesh, Vietnam, India, Malaysia, China |
| ไห | Thailand |