Cognomen Khairullayev (Khairullayev 
, Хаируллаев 
) , globally, is a rare last name. The cognomen Khairullayev is habitual in Uzbekistan, where it is a rare surname, Kazakhstan, where it is a very rare surname, and Russia.
| VARIANT | COUNTRY |
|---|---|
| Khairullayev | Kazakhstan |
| Хаируллаев | Uzbekistan, Russia, Kazakhstan |