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What was the surname of Yan in Jin, Spring and Autumn Period?

Yan surnamed Ji, Yan. The full name of Yan Taizi Dan is Dan. Yanshi, hence the name yan dan. In ancient times, surnames were reserved for women, and men only used surnames instead of surnames, so there was no such thing as "Ji Dan" ("Ying Zheng" is also wrong, but it should be called,, or Qin).