Namesakes
Osman I
(a.k.a. Usman) (m) 1258-1326 
Ottoman Sultans 1281-1326
Osman II
(a.k.a. Usman) (m) 1604-1622
Islamic Caliphs 1618-1622 Ottoman
Ottoman Sultans 1618-1622
Osman III
(a.k.a. Usman) (m) 1699-1757
Islamic Caliphs 1754-1757 Ottoman
Ottoman Sultans 1754-1757
Shehu Shagari
(a.k.a. Usman) (m) 1925-2018
Other Leaders 1979-1983 Nigeria (president)