Surname แก้วไวยุทธ (แก้วไวยุทธ, Keawvaiyuth 
) , in all the world, is an extremely rare cognomen. The surname แก้วไวยุทธ is characteristic of South-eastern Asia, particularly Thailand, where it is an extremely rare surname.
| VARIANT | COUNTRY |
|---|---|
| Keawvaiyuth | Thailand |