Family name สิทธิยา (สิทธิยา 
) , in the world, is a rare surname. The surname สิทธิยา is characteristic of South-eastern Asia, particularly Thailand, where it is a rare surname. Also, สิทธิยา is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| สิทธิยา | Thailand |