Characters in wuxia novels often have surnames like Gongsun, Ouyang or Shangguan.
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history
It first meant "grandson of a duke", and descendants of princes took it as their surname. Bearers include the logician 公孙龙, the Han warlord 公孙瓒 and 孟子's disciple 公孙丑; old genealogies even give it as the clan name of 黄帝, the Yellow Emperor.
