Last name Koinov (Koinov 
, Коинов 
) , across the world, is a rare family name. The cognomen Koinov is characteristic of Bulgaria, where it is a rare surname, Russia, where it is a very rare surname, and Kyrgyzstan. In absolute terms, this name is the most popular in Russia, Bulgaria, and the United States.
| VARIANT | COUNTRY |
|---|---|
| Koinov | Kazakhstan, Russia, Bulgaria, Australia, United States |
| Коинов | Bulgaria, Kazakhstan, Kyrgyzstan, Russia |