Cognomen พงศ์สวัสดิ์ (พงศ์สวัสดิ์ 
, Pongsawat 
, Phongsavat 
) , across the world, is quite a rare surname. The family name พงศ์สวัสดิ์ is habitual in South-eastern Asia, particularly Laos, where it is quite a common surname, Thailand, where it is quite a rare surname, and Singapore, where it is a rare surname. In absolute terms, it most frequently occurs in Thailand, Laos, and the United States. Likewise, พงศ์สวัสดิ์ is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| พงศ์สวัสดิ์ | Thailand |
| Pongsawat | Philippines, Argentina, United States, Thailand, Canada |
| Phongsavat | Laos, United States, Singapore, Thailand, Canada |
| Phongsawath | United States |
Phongsawadi, Phongsawasd, Phongsawasdi, Phongsawatt, Pongsasawat, and Pongsasawath