Cognomen Gairach (ไกราช 
, Gairach ) , all around the world, is an extremely rare family name. The cognomen Gairach is characteristic of South-eastern Asia, particularly Thailand, where it is an extremely rare surname. More frequently, Gairach is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Gairach, ไกราช | Thailand |