Xu surname is one of the surnames in China, and it is a typical multi-ethnic and multi-origin surname. Xu's surname ranks150th among the hundred surnames in Song Dynasty.
Xu's source: According to Yuan He's Compilation, "The homemade wood was destroyed in the thirty-second year of the Zhou Dynasty, and his son was named Xu, and his son was named Zhang Yu in the eleventh year. Zhao destroyed Wu in thirty years, and his descendants took the country as their surname. " According to China's Complete Collection of Surnames, the eldest son of Duke Zhou was sealed in Lu, belonging to "Six Families of Yin People", including Xu, which is the origin of the legendary Xu.
Moreover, his surname was changed to Xu. According to the research on the origin of hundreds of surnames, in the Five Dynasties, doctors changed their surnames to Xu, and later generations took Xu as their surname. In addition, the Xu family in Nanjing was mostly descended from the Song Dynasty, so it was changed to the Xu family because it was not shameful.