Surname แก้วจงประสิทธิ์ (แก้วจงประสิทธิ์, Kaewjongprasit 
) , around the world, is a very rare family name. The cognomen แก้วจงประสิทธิ์ is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Kaewjongprasit | Thailand |