Last name แก้วมงคลมาศ (แก้วมงคลมาศ, Kaewmongkonmas 
) , across the world, is an extremely rare surname. The surname แก้วมงคลมาศ is characteristic of South-eastern Asia, particularly Thailand, where it is an extremely rare surname.
| VARIANT | COUNTRY |
|---|---|
| Kaewmongkonmas | Thailand |