Last name Григорйан (Grigoryan 
, Grigorian , Grigorjan 
) , all over the world, is a common cognomen. The cognomen Григорйан is characteristic of Armenia, where it is a common surname, Georgia, where it is quite a common surname, and Estonia. Measured by absolute frequency, it most frequently occurs in Armenia, the United States, and Russia. Much less frequently, Григорйан is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Grigorian, Grigoryan | Georgia, France, Armenia, United States, Russia |
| Grigorjan | Poland, Estonia, Armenia, Germany, Russia |
| Григорйан | Russia |