Surname สายพงศ์ (Saitthapong 
, Saipong 
, Saiphong ) , in the world, is a rare cognomen. The surname สายพงศ์ is habitual in Thailand, where it is a rare surname, and the United States, where it is an extremely rare surname. Much less frequently, สายพงศ์ is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Saitthapong, สายพงศ์ | Thailand |
| Saipong | United States, Thailand, Philippines |
| Saiphong | United States, Thailand |