Cognomen Phommachan (Phommachan 
) , in all the world, is quite a rare family name. The family name Phommachan is characteristic of Laos, where it is quite a common surname, Thailand, where it is a very rare surname, and the United States, where it is an extremely rare surname. Much less frequently, Phommachan is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Phommachan | Laos, Thailand, United States, Argentina |
Joy, Akkhamonty, Chanounheuan, Kongsang, Kongsong, Keokhunkham, Khammany, Peeravat, Phetdala, Tingkham, Saysamone, Sourivone, Chansamai, Petchsamorn, Thongsouk, Hangamany, Sonepaseuth, Phonevilay, Souksakhone, Phoutthavong, Angkhana, Sonemexai, Sengvanh, Sutipong, Noy, Souk, Kaem, Pany, Pomh, Leva, Tony, Sandy, Angel, Phouangmaly, Chanh, Thong, Alexis, Ammith, Tengon, Vasana, Vichay, Sudarat, Aaliyah, Prasith, Penny, and Thipphakone