Surname สิทธิธร (สิทธิธร 
, Sittitorn , Asithorn 
) , all around the world, is a very rare cognomen. The family name สิทธิธร is characteristic of South-eastern Asia, particularly Thailand, where it is a very rare surname. More frequently, สิทธิธร is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| สิทธิธร, Sittitorn | Thailand |
| Asithorn | United States, Thailand |
Sidhorn, Sitithorn, Sitittorn, Sitthathon, Sitthithon, Sitthithoon, Sitthithul, Sitthithunn, Sitthon, Sittirorn, and Sittithorn