Cognomen Hayder (حيدر 
, Hayder 
, هيدر ) , globally, is a widespread last name. The family name Hayder is characteristic of Western Asia, particularly Iraq, where it is a common surname, Syria, and Lebanon, where it is quite a common surname (explore the name in all countries). Not in comparison with a country's population, it is the most numerous in Iraq, Syria, and Sudan. Much more frequently, Hayder is the forename as well as the last name.
| VARIANT | COUNTRY |
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| حيدر | Iraq, Sudan, Yemen, Syria, Iran |
| Hayder | Iraq, Bangladesh, Tunisia, Sudan, Pakistan |
| هيدر | Iraq |
| Хаыдер | Russia |
| wenceslaus hayder CZ (b. 1450) |
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| georg von hayder (b. 1754) |
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| johann georg hayder DE (b. 1812) |
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| johann hayder DE (b. 1884) |
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| fryderyk hayder painter (1905-1990), PL (b. 1905) |
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| roman hayder UA (b. 1902) |
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| raja hayder Tunisian volleyball player, TN (b. 1948) |
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| mo hayder British author of crime and thriller fiction (1962-2021), GB (b. 1962) |
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| hayder munather Iraqi theater actor (b. 1965) |
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| hayder a. jaafar al-sahlanee chess player (b. 1966) |
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| hayder a. a. al-kashoash researcher ORCID ID = 0000-0001-9681-8285 |
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| hayder amin researcher |
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| hayder adnan fawzi researcher (ORCID 0000-0001-9970-0119) |
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| hayder m al-kuraishy researcher ORCID ID = 0000-0003-3097-2962 |
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| hayder c assad researcher (ORCID 0000-0003-3499-3007) |
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