Namesakes
Notable Explorers and Adventurers:
1 explorer
Diogo Cão c. 1452-1486 
Notable Writers:
1 author
Cao Xueqin 1710-1765
Olympic Medalists:
1 gold, 1 silver
(silver) Cao Zhongrong 2012 modern pentathlon
(gold) Cao Yuan 2012 diving
Saints:
1 saint
Saint Agnes Tsao Kou Ying (a.k.a. Cao) 1833-1856