Because in ancient China, it was normal not to name a country by surname, mainly because there were few surnames at that time, such as Ying Zheng's won surname, Jiang Ziya's Jiang surname, Ji surname, Mi surname, and others like Han Zhaowei or Qu Yuan's Bai surname, all of which were surnames, but actually leitian.

From this point of view, when the Emperor of Zhou decided to enfeoffment princes, most of them were actually given to their relatives, so many of them were Ji surnames, such as Yan State, one of the Seven Chivalrous Men, and Jin State, the overlord in the Spring and Autumn Period. It is impossible to name a country by his own surname, but 1 can be named after a place. For example, when Yan Zhaogong was given to Yan, Zixie moved.

Therefore, due to the high similarity of surnames, countries cannot be named after surnames, but why can Han, Zhao and Wei do so? It is mainly because they became a country late. At the end of the Spring and Autumn Period, the king of Zhou was weak, and only Sanqing was left in the State of Jin. Therefore, under pressure, the king of Zhou finally recognized the legal status of Sanqing, so the three clans were divided into Jin, that is, Han, Zhao and Wei, and the three clans were divided into Jin and Tian, which were two landmark events in the history when the Spring and Autumn Period entered the Warring States Period.

In addition, in the Han, Zhao and Wei dynasties, the Han and Wei dynasties were all surnamed Ji. Only Zhao Bi's ancestors were given the surname Zhao for their meritorious service in the imperial car. In the early years, the ancestors of Qin people always attached themselves to Zhao. Later, he was made a vassal because of his meritorious service in raising horses, and was given the land of Guanzhong when he moved eastward. Correcting the old Qin people got the title of vassal with iron blood and got their own fief.