It is named after the five elements. Zhu Di is next to the word wood, wood makes fire, his son Zhu Gaochi is next to the word fire: fire makes earth, Zhu Zhanji is next to the word earth: earth makes gold, Zhu Qizhen and brother Zhu Qiyu are next to the word gold: gold makes water, and Zhu Jianshen is next to the three-point water: Water produces wood, Zhu You next to the word "wood": wood produces fire, Zhu Houzhao's name means fire, Zhu Houzhao is the character for fire: fire produces earth, Zhu Zai'e is the character for earth: earth produces gold, Zhu Yijun is the character for gold: gold produces water, Zhu Changluo has three points of water : Water produces wood, Zhu Youxiao Zhu Youjian wood character.