Uncle Yu is Ji Fa's second son, Zhou Wuwang (the third son). After the King Wu destroyed the Shang Dynasty, the princes were enfeoffed on a large scale. He gave the kingdom to Shu Yu, who was an uncle at first, and his name came from the fief.
Later, Yu's descendants took the country as their surname, and some took Yu as their surname. Later, they simply removed the Yu family near the city and renamed it Yu family. The surname Yu in history is true, it is the surname Yu in Henan, and it is the ancestor of the surname Yu.
Yu's origin
1, from the surname Ji, is a descendant, and takes the country name as the surname. According to the New Tang Book Prime Minister's Pedigree Table, in the early years of the Western Zhou Dynasty, after the Shang Dynasty, Zhou Wuwang made great efforts to enfeoffment the vassal, and his second uncle was sealed in Zhi State. Later, the descendants of Zhi Shu took the country as their surname, some took Zhi as their surname, and some went to town to take Yu as their surname and Henan as their surname. During the Spring and Autumn Period and the Warring States Period, there was chaos, and the descendants of Zhi Shu moved to Tancheng, Shandong Province, becoming Yu's family in Shandong Province.
2. Since ancient times, Emperor Yan's surname, Jiang, is a descendant of Chunyu Kun, a writer. In the Tang Dynasty, he changed his surname from Emperor Xianzong's Spring Calendar. According to the dialectics of ancient and modern surnames, the descendants of Chunyu take the country name as their surname, which is called Chunyu's surname.
During the Zhenguan period of the Tang Dynasty, the royal family had seven surnames, including Chunyu. To Li, in order to avoid taboo, the compound surname Chun was changed to the single surname Yu. In the Song Dynasty, some Yu surnames were restored to Chunyu surnames, while others remained unchanged, forming a branch of Yu surnames.
3. Wan Yu, who came from the early Northern Wei Dynasty and changed his surname in Pingcheng, avoided the Three Kingdoms Rebellion. According to "History of Taoism", Wanwanyu of Xianbei nationality was originally a Shandong Yu family, and later changed with Xianbei customs. Emperor Xiaowen reformed in Chinese and returned to his surname.
In fact, they are descendants of Yu Gong in Han Dynasty. During the Three Kingdoms War, in order to survive among Xianbei people, he left the Central Plains with his domineering neighbors and changed his surname to Wan Yu. Later, Tuoba GUI, a Xianbei nationality, established the Northern Wei Dynasty in northern China, and then returned to the Central Plains. Many Yu people who live in the north, even the Yu people who moved to the whole country, belong to this family.
4. Give one's own surname or change the surname of a minority. In the Ming Dynasty, Bayandali was given the surname Zhong Ming, and in the Qing Dynasty, parts of Nimaha in the south were changed to his surname. There are also ethnic minorities such as Daur, Oroqen, Tu, Hui and Koryo who change their surnames.