Why are Vietnamese surnamed Ruan?

The surnames of Jing nationality, the main ethnic group in Vietnam, are Ruan, Chen, Wu and Li. Not all are surnamed Ruan. The Vietnamese nation is a branch of Chinese nation. In the ancient Pang Hong era (2879 BC), it was called Wenlang, and it was renamed as My Account by the owner of the State of Shu, Anyang Wang. In the twenty-sixth year of King Qin of China, Qin unified the world and sealed Xiang County. Later, Emperor Wu of the Han Dynasty sealed Jiao Zhi, which continued the Eastern Han Dynasty, the Six Dynasties, the Sui Dynasty, the Tang Dynasty and the Five Dynasties, and became a vassal of China 1040. After the Song Dynasty, Vietnam became independent on the surface. After Wu, Ding, Li, Li, Chen, Hu and Ruan dynasties, Vietnam still paid tribute to China. During Shi Ding's independence, its national name was DAI CO VIET. Hajj Lee was renamed Dai Yue, and it was not until China officially recognized it as an Annan country. Later, King Jialong of Ruan Dynasty unified North Vietnam (AD 1802) and named it Vietnam. Therefore, Nguyen is the most popular surname in Vietnam, and it is also a noble family with strong influence. Not only the prime minister and chairman are surnamed Ruan, but also all previous dynasties, and the country name is Ruan.