Surname Sinpunja (Sinpunja 
) , in all the world, is a very rare last name. The cognomen Sinpunja is characteristic of South-eastern Asia, particularly Thailand, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Sinpunja | Thailand |
Sutach, Kanach, Suttiporn, and Thatchapoom