Our country has never directly used surnames as country names.
The only Chen (Chen of the Southern Dynasty) is just because his title and surname happen to be the same.
There are three more points:
Zhao Kuangyin’s Song Dynasty is Song Dynasty, and there is no such thing as Song Dynasty, so even if he is named Zhao, he is still Zhao, and there is no Great Zhao Dynasty. The first person who shamelessly added large characters in front of the country name was Yuan.
It was an accident that Zhao Kuangyin named his country Song. Although he served as a military governor of the German Army and led Songzhou from afar, he checked in front of the palace and never went to Songzhou at all. And speaking of it, in addition to Danggui Dejun, he also served as the military envoy of Yicheng Army (Huazhou), Zhongwu Army (Xuzhou), and Dingguo Army (Tongzhou). That means that the existence of the Song Dynasty is really only 1/4 The probability is that the remaining 3/4 should be called Hua Chao, Xu Chao, or Tong Chao, neither Zhao's turn.
Zhou Shizong once named Zhao Kuangyin and his father, father and son, as "Tianshui County Men", and banned soldiers under the same code, so he wanted to recognize his ancestors and return to the clan to give him a national title (there is such a thing, such as Jianzhou Yin State), combined with the surname Zhao, the desired country name is obviously Qin, how could it be Zhao?