Surname แก้วมหาดไทย (แก้วมหาดไทย, Kaewmahatthai 
) , around the world, is an extremely rare family name. The last name แก้วมหาดไทย is habitual in South-eastern Asia, particularly Thailand, where it is an extremely rare surname.
| VARIANT | COUNTRY |
|---|---|
| Kaewmahatthai | Thailand |