Why did the king of Dali name himself like this?

Today, when I was looking through the history of China people, I suddenly found a name in the paragraph that mentioned Kublai Khan's destruction of Dali: "Duan Xingzhi". Why do you think it should be "Duan Zhixing"? GOOGLE on the computer, it turns out that Duan Xingzhi is Duan Zhixing's grandson. Stare at kingdom of dali's name again, Duan Siping-Duan Siying-Duan Siliang-Duan Sicong-Duan Sushun-Duan Suying-Duan Sulian-Duan Suzhen-Duan Suxing-Duan Silian-Duan Lianyi-Duan Suhui-Duan Zhengming-Duan Zhengchun-Duan Zhengyan-Duan Zhengxing-Duan Zhixing-Duan Zhilian-Duan Zhixiang-Duan Xiangxing-Duan Well, the first impression is that this family practiced the one-yang finger well, and all of them lived a long life. Only the four "thinking" characters in front of them surpassed the history of our two brothers, Zhao Kuangyin and Zhao Guangyi, being emperors in the Song Dynasty. But stare again, no, Si A is Si B's father, Si C is Si B's uncle, and Si D is Si C's son! That is to say, these four people share two generations equally. Looking down, there are seven "vegetarian" characters. Su B is the father of Su C and Su D, and Su F is the grandson of Su E. It seems that three generations are intertwined. Jin Yong chose Duan Dahe, Duan Er and Duan Er Tawa in Dali, and made a crepe of "Eight Dragons", from which you can find the names of Duan Da and Duan Er with wide eyes, which is not bad. They are all "positive" characters ... DuDu! The next one is still a "positive" generation! Yes, he is Duan Yu in history! His other name is "Duan Heyu"! Seeing this, who still thinks that the last three "wisdom" are three brothers, who is McDull. Looking down, Nandi came out, Duan Zhixing. Look further, yo-ho, Duan Xingzhi is here. What's more, kingdom of dali can't admire a few Chinese characters, and he can't bear to change them. I think of Zhu Yuanzhang. Wood, fire, soil and water are rated radicals in the names of his descendants, and they have a reincarnation every five rounds, forcing them to play artificial word-making games at last. Internet search, kingdom of dali turned out to be a Bai! No wonder, his name may also be transliteration? Nothing was found. We should know that Dali is not a vassal of China for a year or two, and the degree of sinicization should be quite high, but why is there such a naming method? It's incredible.