Why did Shang Emperor like to be named after its branch?

According to legend, there were ten suns in ancient times. Their names were A, B, C, D, E, G, Xin, Ren and Gui. Every day a sun shines on the world, and the eleventh day is called ten days. The names of these ten suns are called "Ten Dry" or "Heavenly Dry". The royal family and aristocratic class in Xia and Shang Dynasties worshipped the sun god and regarded themselves as descendants of the sun god. The emperor ascended the throne, claiming that the sun shines on the earth, reigns over everything, and dominates the rise and fall. Taking the Japanese name as the name of the emperor is the embodiment of this idea. Kongjia, Yinjia and Guilu were other emperors in Xia history. Xia Jie is like walking on a laurel tree. Shang kings are all Japanese names, and the thirty-one kings from Dayi (Tang) to Zhou (Zhou) were all named after Shigan. "Businessmen have children in the name of Japan", which is the consistent view of ancient scholars. In Shang dynasty, ten-day was used as the date, and ten-day and ten-day were used as the main units to record time. The day when the king was born is considered as the day when the sun came to the world. If he was born on the first day, he will be given the first name and the second name the next day. However, if another Shang Wang born in Jiari is born, it is considered as Sun Jia's second visit to the world. In order to distinguish them, the words "big (too)", "middle (middle)" and "little (small)" were added before Japanese names. Xu Zhongshu's "Yin Shang Nationality and Yin Family" quoted ancient records: "White Tiger Pass" was named after the birthday of Yunyin people. Textual research on ancient history says that "the master of a temple dies in the name of the emperor". I think a birthday is more reliable. For example, in history, it was written that Xin died in Jiazi, but he didn't use Jiazi as his name, which means Xin said that Xin didn't use the name of the day he died. At the same time, if the day of death is named, wouldn't it be that no one called him by this name decades before his death? Who knows this is him after death? This is not in the naming sense. In the name of birthday, completely put an end to this unreasonable situation. "In Guo Moruo's" Criticism of Ten Books: Self-criticism of Ancient Learning ",it is mentioned that the name is the anniversary rather than the birthday. However, Luo Zhenyu said in Preface to Yin Wencun: "Kao Yin people take Japan as their name. The Japanese name system was also used at the beginning of the Zhou Dynasty. " It is also pointed out that from the Shang Dynasty to the early Zhou Dynasty, after the death of nobles, they all called their dead ancestors by their personal names, such as Ten-Day Gong (that is, A, B, C, D, etc. ), such as the flower king, father, bi, mother. So as to distinguish the appellation differences between emperors and ancestors. The titles of Shang emperors don't have such names as "Kao, Father, Bi and Mother", so they are more likely to be named after their birthdays.