Cognomen มนูญชัย (มนูญชัย 
, Manunchai , Manoonchai 
) , in the entire world, is a rare last name. The surname มนูญชัย is characteristic of Thailand, where it is a rare surname, Malaysia, where it is an extremely rare surname, and the United States. Likewise, มนูญชัย is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Manunchai, มนูญชัย | Thailand |
| Manoonchai | Thailand, United States, Malaysia |
Mannoochai, and Manuthchai