Surname ตั้งสิทธิวัฒน์ (ตั้งสิทธิวัฒน์, Tangsittiwat 
) , in all the world, is a very rare cognomen. The family name ตั้งสิทธิวัฒน์ is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Tangsittiwat | Thailand |