Family name Keosayan (Keosayan 
, Кеосаян 
) , worldwide, is a very rare cognomen. The family name Keosayan is characteristic of Eastern Europe, particularly Bulgaria, where it is a rare surname, and Russia, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Keosayan | Bulgaria |
| Кеосаян | Russia |