Family name حيدر (حيدر 
, Haider 
, Haidar , among others...) , all over the world, is a widespread last name. The surname حيدر is characteristic of Western Asia, particularly Lebanon, where it is a widespread surname, Syria, where it is a common surname, and Iraq (explore the name in all countries). Measured by absolute frequency, it is commonest in Pakistan, Iraq, and Bangladesh. More prevalently, حيدر is the forename as well as the last name.
| VARIANT | COUNTRY |
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| حيدر | Iran, Yemen, Syria, Sudan, Iraq |
| Haidar, Hayder, Haider, Haydar | Bangladesh, India, Pakistan, Iraq, Turkey |
| Heydar | India, Pakistan, Iraq, Saudi Arabia, Turkey |
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إبراهيم أسعد حيدر Lebanese politician, LB (b. 1867) |
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رستم حيدر Iraqi politician, IQ (b. 1889) |
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| محمد بن عيسى آل حيدر Iraqi Islamic scholar and poet, IQ (b. 1866) |
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علي حيدر Former commander of Syrian Special Forces, SY (b. 1932) |
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جميل حيدر Iraqi poet and writer, IQ (b. 1935) |
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| جودت حيدر Lebanese poet (1905-2006), LB (b. 1905) |
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| أسد حيدر Iraqi religion historian, IQ (b. 1908) |
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| سليم نجيب حيدر Lebanese writer, poet, diplomat and politician, LB (b. 1911) |
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| كمال حيدر Yemeni writer, YE (b. 1933) |
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إنصاف حيدر Saudi human rights activist, wife of Raif Badawi, SA (b. 1985) |
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| طلال حيدر born 1937 in Baalbeck - is a Lebanese poet., LB (b. 1937) |
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محمد حيدر Lebanese football player, LB (b. 1989) |
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عدنان حيدر Lebanese footballer, LB (b. 1989) |
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| كاظم حيدر IQ (b. 1932) |
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| بشار حيدر LB (b. 1943) |
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علي, الحسيني, البديري, الساعدي, السعيدي, الدراجي, الجبوري, الجنابي, الربيعي, الركابي, الخزعلي, الخفاجي, التميمي, المالكي, الموسوي, المياحي, القريشي, الكناني, الحسناوي, البصراوي, البهادلي, الفتلاوي, العكيلي, المحمداوي, العبودي, العبادي, حسن, احمد, عباس, حسين, محمد, كريم, كاظم, العلي, الطيب, الملك, الحنين, السعدي, الشمري, الاسدي, الطائي, الملكي, الكرار, الكعبي, اللامي, العامري, العراقي, العبيدي, and الكربلائي