List of Famous people with last name I

Adolph I of Cleves was the second Count of Cleves and the fourth Count of Mark.

Saud I bin Muhammad Al Muqrin was the eponymous ancestor of the House of Saud, otherwise known as the Al Saud.

John I of Brabant, also called John the Victorious was Duke of Brabant (1267–1294), Lothier and Limburg (1288–1294). During the 13th century, John I was venerated as a folk hero. He has been painted as the perfect model of a brave, adventurous and chivalrous feudal prince.

Dom Afonso I of Braganza was the first Duke of Braganza and the eighth Count of Barcelos. He would start a dynasty, the House of Braganza, that would end up being the most powerful and wealthy in all of Portugal. His descendants would go on to become high-ranking nobles, imperial officials, and even the Kings of Portugal and the Emperors of Brazil.

Prince Miloš Obrenović I of Serbia born Miloš Teodorović was Prince of Serbia from 1815 to 1839, and again from 1858 to 1860. He participated in the First Serbian uprising, led Serbs in the Second Serbian uprising, and founded the House of Obrenović. Under his rule, Serbia became an autonomous principality within the Ottoman Empire. Prince Miloš ruled autocratically, consistently refusing to share power, which generated strong domestic opposition. During his rule, Miloš I bought a number of estates and ships from Ottoman Turks and also became a prominent trader. He was the richest man in Serbia and one of the richest in the Balkans, with estates in Vienna, Serbia and Wallachia.

Peter I of Bourbon was the second Duke of Bourbon, from 1342 to his death.

Paco Ignacio Taibo I, was a prolific Spanish-Mexican writer and journalist.

Vladislaus I was Duke of Bohemia from 1109 to 1117 and from 1120 until his death.

Charibert I was the Merovingian King of Paris, the second-eldest son of Chlothar I and his first wife Ingund. His elder brother Gunthar died sometime before their father's death. He shared in the partition of the Frankish kingdom that followed his father’s death in 561, receiving the old kingdom of Childebert I, with its capital at Paris.

Ali Reza Pahlavi was the second son of Reza Shah Pahlavi, Shah of Iran, and the brother of Mohammad Reza Pahlavi. He was a member of the Pahlavi dynasty.