Among the sons of Ji Chang recorded in the "History of Guan Cai Shijia", even Ji Fa records the king of Zhou Wu, not the name Ji Fa. Therefore, the ancient method of naming names for men and women is not the same, the women of the aristocratic family will take the official name when they reach the age of 15, their name is with a surname, the reason why women have a surname is to avoid the consequences of marriage between close relatives. In the past, there were often intermarriages between clans, because men did not take surnames according to blood, so women did not know whether the man was his brother or relative, and if he distinguished, he would avoid it, which was called "man called surname, woman called surname".
In addition to the difference between men and women, men's names also depend on the ranking among brothers, and it can be seen from Ji Chang's sons that there are uncles, uncles, and ji. Take Uncle Mao Zheng, "Mao" refers to a fiefdom; "Uncle" refers to the ranking, and "Zheng" is his original name, so he was actually called "Ji Zheng". But when people call him "Zheng", you can also call him "Uncle Zheng" or "Uncle Mao Zheng", but you must not call him "Ji Du", because that is a great disrespect.
However, because some people have special titles or thrones, they can not take names according to the above arrangement. For example, King Wu of Zhou and Gongdan of Zhou, if everyone calls him "egg", it is quite disrespectful to people, and to a certain extent, people will be unsafe. Bo Yikao's name is different from that of several other brothers, because he died before the establishment of the Zhou Dynasty, so there was no fief or the like, so he put his ranking "Bo" in the first place, and "Yi Kao" was the honorific title used for sacrifice after his death, showing respect and remembrance.
In the "Chronicle of History, Volume 35", it is recorded that Ji Chang was originally libo Yikao as the crown prince, but after investigation, it was felt that Ji Fa had more talent for governing the country than Bo Yi kao, so ji fa was made a prince, and Bo Yi Kao died before the establishment of the dynasty, so in order to commemorate him, he was called Bo Yi Kao. In that era, names and status were linked, and if you put it up now, you don't know how many people can keep their original names.