Family name คงสมศักดิ์ศิริ (คงสมศักดิ์ศิริ 
) , across the world, is a very rare last name. The last name คงสมศักดิ์ศิริ is characteristic of South-eastern Asia, particularly Thailand, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| คงสมศักดิ์ศิริ | Thailand |