Surname สิจา (Sija 
, สิจา 
) , all around the world, is quite a rare last name. The cognomen สิจา is habitual in Tanzania, where it is a rare surname, Guatemala, and Indonesia. Not in comparison with a country's population, it is the most numerous in Indonesia, India, and Tanzania. More prevalently, สิจา is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Sija | Bangladesh, Tanzania, India, Indonesia, Ethiopia |
| สิจา | Thailand |