Cognomen หาญชัย (หาญชัย 
, Hanchai 
, Harnchai ) , all around the world, is a rare surname. The surname หาญชัย is habitual in Thailand, where it is quite a rare surname, China, where it is an extremely rare surname, and the United States. Also, หาญชัย is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| หาญชัย | Thailand |
| Hanchai | Greece, Thailand, United States, India, China |
| Harnchai | Thailand, China |