Surname Gaydayev (Гайдаев 
, Gaydayev 
) , in all the world, is a rare cognomen. The cognomen Gaydayev is habitual in Belarus, where it is a rare surname, Kazakhstan, and Russia.
| VARIANT | COUNTRY |
|---|---|
| Гайдаев | Kazakhstan, Belarus, Kyrgyzstan, Russia, Ukraine |
| Gaydayev | United States |