Cognomen ธนไชย (ธนไชย 
) , in the entire world, is an extremely rare surname. The family name ธนไชย is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname. More frequently, ธนไชย is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| ธนไชย | Thailand |