Family name جعفر (جعفر 
, Jafar 
, Cafer 
, among others...) , in the world, is a widespread last name. The family name جعفر is habitual in Lebanon, where it is a common surname, Malaysia, and Bahrain (explore the name in all countries). Not in comparison with a country's population, it most frequently occurs in Malaysia, India, and Egypt. More prevalently, جعفر is the forename as well as the last name.
| VARIANT | COUNTRY |
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| جعفر | Syria, Iraq, Egypt, Sudan, Iran |
| Jafar, Jaafar | Turkey, Nigeria, Pakistan, Malaysia, India |
| Cafer | Saudi Arabia, Iraq, Turkey, Malaysia, India |
| Jaffar | Pakistan, Nigeria, Indonesia, Malaysia, India |
| Gaafar | Nigeria, Lebanon, Pakistan, Malaysia, India |
| Ja'Far | Saudi Arabia, Syria, Nigeria, Indonesia, Malaysia |
| Ja'Afar | Saudi Arabia, Nigeria, Indonesia, Malaysia, India |
| إسماعيل بن جعفر Elder son of Imam Ja'far al-Sadiq (c.719–c.762), SA (b. 721) |
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| إسماعيل بن جعفر KW (b. 747) |
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| زبيدة بنت جعفر Medieval Arabian princess, IQ (b. 766) |
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| قدامة بن جعفر Abbasid Caliphate scholar, IQ (b. 873) |
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ضياء جعفر former Iraqi minister, IQ (b. 1910) |
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فرخ جعفر Indian actress and radio presenter, IN (b. 1933) |
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مصطفى بن جعفر Tunisian politician and physician, TN (b. 1940) |
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فاروق جعفر Egyptian footballer, EG (b. 1952) |
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جاسم محمد جعفر Iraqi politician, IQ (b. 1958) |
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| فؤاد جعفر Egyptian actor, EG (b. 1916) |
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بدر جعفر Business entrepreneur, AE (b. 1979) |
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| علي حمد جعفر LB (b. 1924) |
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| محمد راضي جعفر Iraqi poet, IQ (b. 1941) |
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| جعفر ضياء جعفر Iraqi nuclear physicist, IQ (b. 1943) |
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مها جعفر Sudanese-Iraqi activist and social media influencer, SD (b. 1994) |
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علي, الطائي, الملكي, الكعبي, سليمان, العامري, العراقي, العبودي, الساعدي, الدراجي, الجبوري, الربيعي, الخفاجي, التميمي, المالكي, الموسوي, المياحي, الكناني, ابراهيم, اسماعيل, عبدالله, البصراوي, الطيار, المحمداوي, الصادق, الشمري, حسن, احمد, عباس, حسين, حيدر, صادق, صالح, محمد, كاظم, يوسف, العلي, الملك, احمدي, عثمان, حيدري, رضائي, جعفري, محمدي, محمود, مرادي, الحنين, الاسدي, and الكربلائي