Family name Зайнов (Зайнов 
, Zainov 
, Zaynov 
) , all around the world, is a very rare cognomen. The surname Зайнов is habitual in Kazakhstan, where it is a rare surname, Israel, where it is a very rare surname, and Russia, where it is an extremely rare surname. Not in comparison with a country's population, it is commonest in Kazakhstan, Russia, and Ukraine. Very seldom, Зайнов is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Зайнов | Ukraine, Russia, Kazakhstan |
| Zainov | Ukraine, United States, Russia |
| Zaynov | Israel |