Surname สายพันธุ์ (Saiphan 
, สายพันธุ์ , Breedon 
) , in the world, is quite a rare last name. The cognomen สายพันธุ์ is characteristic of Australia, where it is a rare surname, Thailand, and the United Kingdom. Measured by absolute frequency, it most frequently occurs in Thailand, the United Kingdom, and the United States. Very seldom, สายพันธุ์ is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Saiphan | Brazil, Thailand, India |
| Saiphant, สายพันธุ์ | Thailand |
| Breedon | Australia, Canada, Thailand, United Kingdom, United States |