Family name วินิจชัย (วินิจชัย 
, Winitchai , Vinitchai 
) , throughout the world, is a rare last name. The last name วินิจชัย is characteristic of Thailand, where it is a rare surname, and the United States, where it is an extremely rare surname. Also, วินิจชัย is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Winitchai, วินิจชัย | Thailand |
| Vinijchai, Vinitchai | United States, Thailand |