Cognomen Adjain (Adjain 
) , all over the world, is a rare surname. The family name Adjain is characteristic of Philippines, where it is a very rare surname, Malaysia, where it is an extremely rare surname, and France. Measured by absolute frequency, it is the most numerous in Philippines, France, and the United States.
| VARIANT | COUNTRY |
|---|---|
| Adjain | Malaysia, United States, Philippines, France |