Cognomen Phomphachanh (Phomphachanh 
) , worldwide, is a rare surname. The surname Phomphachanh is habitual in Laos, where it is quite a rare surname, the United States, where it is an extremely rare surname, and Canada.
| VARIANT | COUNTRY |
|---|---|
| Phomphachanh | Laos, United States, Canada |