Surname ภูธนชัย (ภูธนชัย 
, Poothanachai , Phuthanachai 
) , worldwide, is a very rare family name. The surname ภูธนชัย is habitual in Thailand, where it is a very rare surname, and the United States, where it is an extremely rare surname. Very seldom, ภูธนชัย is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| ภูธนชัย, Poothanachai | Thailand |
| Phuthanachai | United States, Thailand |