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Cognomen Khaydar (Хайдар
, Хаыдар
, Хаидар
) , in all the world, is a rare surname. The cognomen Khaydar is characteristic of Kyrgyzstan, where it is quite a rare surname, Belarus, where it is a rare surname, and Kazakhstan. Not in comparison with a country's population, it is commonest in Russia, Kyrgyzstan, and Morocco. More frequently, Khaydar is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Хайдар | Uzbekistan, Kazakhstan, Tajikistan, Russia, Azerbaijan |
| Хаыдар | Russia |
| Хаидар | Russia, Tajikistan, Kazakhstan |
| Khaydar | Uzbekistan, Morocco, Tajikistan, Russia, Germany |