Cognomen Birdhaja (Birdhaja 
) , throughout the world, is a very rare surname. The family name Birdhaja is habitual in Southern Asia, particularly India, where it is an extremely rare surname. Much less frequently, Birdhaja is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Birdhaja | India |
Hemam, Leimapokpam, and Thounaojam