The courtesy name Mengde is indicative of Cao Cao's lineage, as it originates from the name of his great-grandfather, Cao Teng, who was adopted into the Xiahou clan and given the courtesy name Miaocai (孟才), thus establishing the character 孟 (mèng) as a generational name for Cao Cao's branch of the Cao family.
Conquer with Cao Cao: How much do you know about the famous Chinese warlord and statesman?