Family name Phengphommachanh (Phengphommachanh 
) , across the world, is a rare cognomen. The last name Phengphommachanh is habitual in South-eastern Asia, particularly Laos, where it is quite a rare surname, and Thailand, where it is an extremely rare surname.
| VARIANT | COUNTRY |
|---|---|
| Phengphommachanh | Laos, Thailand |