Yet in the Song dynasty, after the lot of the common people improved, they would use the word "turtle" to make sarcastic references about the nobles. In the Qing dynasty book Chihbei Outan, Wang Shizhen says that during the Han, Tang and Song dynasties many people used the character for turtle (gui), in their names. But by the Ming dynasty, no one was using it.
清朝王士禎在《池北偶談》中曾說到，漢、唐、宋以來，取龜字命名者，不可勝記，到了明朝，卻成為忌諱，殊不可解。