Worldwide, Зайнуллаев (Зайнуллаев 
, Zainullaev, Zaynullaev 
) is an extremely rare unknown gender first name. Much more prevalently, Зайнуллаев is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Зайнуллаев | Kyrgyzstan, Kazakhstan, Russia |
| Zaynullaev | United States |