class or grade; generation; plaintiff and defendant (old); government department (old)

Cao Cao (155-220), famous statesman and general at the end of Han, noted poet and calligrapher, later warlord, founder and first king of Cao Wei 曹魏, father of Emperor Cao Pi 曹丕; the main villain of novel the Romance of Three Kingdoms 三國演義|三国演义

Cao Can (-190 BC), second chancellor of Han Dynasty, contributed to its founding by fighting on Liu Bang's 劉邦|刘邦[Liu2 Bang1] side during the Chu-Han Contention 楚漢戰爭|楚汉战争[Chu3 Han4 Zhan4 zheng1]; also pr. [Cao2 Shen1]

Cao Pi (187-226), second son of Cao Cao 曹操, king then emperor of Cao Wei 曹魏 from 220, ruled as Emperor Wen 魏文帝, also a noted calligrapher

Cao Chong (196-208), son of Cao Cao 曹操[Cao2 Cao1]