Family name Koulajian (Koulajian 
) , in all the world, is a very rare last name. The surname Koulajian is characteristic of Lebanon, where it is a rare surname, the United States, where it is an extremely rare surname, and Brazil.
| VARIANT | COUNTRY |
|---|---|
| Koulajian | Lebanon, Brazil, United States |
| khajag koulajian |
|