Cognomen المهدي (Mehdi 
, Mahdi , المهدي 
) , across the world, is a widespread surname. The last name المهدي is habitual in Bahrain, where it is a common surname, Algeria, and Djibouti (explore the name in all countries). Not in comparison with a country's population, this name is the most popular in Algeria, Morocco, and Pakistan. More frequently, المهدي is the forename as well as the last name.
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أبو عبد الله محمد المهدي 3rd Abbasid caliph (r. 775–785), IR (b. 744) |
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| علية بنت المهدي Iraqi poet, IQ (b. 777) |
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نرجس والدة المهدي Mother Muhammad al-Mahdi, IQ (b. 850) |
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محمد بن الحسن المهدي twelfth and last Imam in Shia Twelver of Islam, IQ (b. 869) |
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| المهدي بالله محمد بن هشام Caliph of Córdoba during 1009, ES (b. 980) |
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| المهدي علي بن محمد Imam of Yemen, YE (b. 1305) |
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| المهدي أحمد بن يحيى Imam of the Zaidi state in Yemen, YE (b. 1373) |
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| محمد الشيخ المهدي first Wattasid Sultan of Morocco and King of Fez, MA (b. 1500) |
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محمد احمد بن عبد الله المهدي Religious leader in the Sudan, self-proclaimed as the Mahdi (1844-1885), SD (b. 1844) |
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| المهدي الوزاني MA (b. 1849) |
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المهدي بن بركة Moroccan politician (UNFP) (1920-1965), MA (b. 1920) |
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| المهدي المنبهي Moroccan diplomat, MA (b. 1870) |
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صالح المهدي musician and composer, TN (b. 1925) |
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المهدي المنجرة Moroccan academic (1933-2014), MA (b. 1933) |
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الصادق المهدي Prime Minister of Sudan (1966–67; 1986–89), SD (b. 1935) |
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