Family name Machainam (Machainam 
) , all over the world, is a very rare last name. The surname Machainam is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Machainam | Thailand |
Ocha, Kunyapat, Pitchaya, Natthaporn, and Natthachai