Family name สมานไชย (สมานไชย 
) , throughout the world, is an extremely rare surname. The cognomen สมานไชย is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname. Likewise, สมานไชย is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| สมานไชย | Thailand |