Cognomen แก้วมงคลศักดิ์ (แก้วมงคลศักดิ์, Kaewmongcolsak 
) , around the world, is an extremely rare last name. The last name แก้วมงคลศักดิ์ is characteristic of South-eastern Asia, particularly Thailand, where it is an extremely rare surname.
| VARIANT | COUNTRY |
|---|---|
| Kaewmongcolsak | Thailand |