Family name สิทธิพันธ์ (สิทธิพันธ์ 
, Sittipan 
, Sitthiphan 
) , throughout the world, is quite a rare cognomen. The surname สิทธิพันธ์ is characteristic of South-eastern Asia, particularly Laos, where it is quite a common surname, and Thailand, where it is quite a rare surname. Likewise, สิทธิพันธ์ is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| สิทธิพันธ์, Sitthipan | Thailand |
| Sittipan | Thailand, United States |
| Sitthiphan | Laos, Thailand |
Aitthiphan, Siddhiphan, Sidthiphan, Sithiphan, Sithiphanh, Sithtipan, Sithtipun, Sitiphan, Sittaphan, Sitthipanch, Sitthiphun, Sitthipun, Sittipant, Sittiphan, Sittiphun, Sittipun, and Sittipunt