Family name วงศ์เกษมศิริ (วงศ์เกษมศิริ 
, Vongkasemsiri 
) , in all the world, is a very rare cognomen. The surname วงศ์เกษมศิริ is habitual in Thailand, where it is a very rare surname, and the United States, where it is an extremely rare surname.
| VARIANT | COUNTRY |
|---|---|
| วงศ์เกษมศิริ | Thailand |
| Vongkasemsiri | United States, Thailand |