Namesakes

Islamic Caliphs: 1 caliph
Caliph Hassan Al-Mustadi   1170-1180   Abbasid  
Nobel Prize Winners: 1 chemistry
(chemistry) Ahmed Zewail (a.k.a. Hassan)   1999  
Notable Athletes: 1 soccer
(soccer) Hassan Yebda   1984-  
Other Leaders: 1 president
President Ali Hassan Mwinyi   1985-1995   Tanzania