Family name Эркаев (Эркаев 
, Erkaev 
, Erkayev ) , in all the world, is a rare last name. The cognomen Эркаев is habitual in Uzbekistan, where it is quite a rare surname, Kyrgyzstan, where it is a rare surname, and Russia, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Эркаев | Kyrgyzstan, Uzbekistan, Russia, Kazakhstan |
| Erkaev | Uzbekistan, Russia, United States |
| Erkayev | Uzbekistan, Russia |
| мулло эркаев TJ (b. 1910) |
|