Family name Haydar (حيدر 
, Haydar 
, Хайдар 
) , in the world, is a widespread surname. The cognomen Haydar is characteristic of Western Asia, particularly Syria, where it is a common surname, Iraq, and Lebanon (explore the name in all countries). Not in comparison with a country's population, the name is most common in Iraq, Syria, and Sudan. Much more prevalently, Haydar is the forename as well as the last name.
| VARIANT | COUNTRY |
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| حيدر | Iran, Iraq, Yemen, Sudan, Syria |
| Haydar | Bangladesh, Iraq, India, Lebanon, Turkey |
| Хайдар | Kazakhstan, Uzbekistan, Russia, Tajikistan, Azerbaijan |
| Gaidar | Argentina, Russia, United Kingdom, United States, India |
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darren haydar Canadian ice hockey player, CA (b. 1979) |
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sultan haydar Ethiopian-born athlete running for Turkey, TR (b. 1985) |
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mona haydar American rapper and poet, US (b. 1988) |
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| joseph haydar Australian weightlifter (b. 1938) |
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| loutfallah haydar Syrian diplomat (1940-2008) (b. 1940) |
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| hüseyin haydar Turkish poet, TR (b. 1956) |
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| paula haydar American academic and translator, US (b. 1965) |
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| ghada haydar researcher |
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| amani haydar Australian writer and visual artist, AU |
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| sara haydar researcher (ORCID 0000-0003-0795-1733) |
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| syed mohammed ali haydar researcher (ORCID 0000-0002-2694-980X) |
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| dalia haydar researcher |
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| mazen haydar researcher |
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| sahar haydar researcher (ORCID 0000-0001-8150-2421) |
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| seyed haydar Iranian calligrapher |
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