Family name แก้วแสงธรรม (แก้วแสงธรรม, Keawseangtham 
) , around the globe, is an extremely rare cognomen. The last name แก้วแสงธรรม is habitual in South-eastern Asia, particularly Thailand, where it is an extremely rare surname.
| VARIANT | COUNTRY |
|---|---|
| Keawseangtham | Thailand |