If the Yuan Dynasty government really prohibited people from using official names, then these people would at best be able to assign their names privately, and they would probably not dare to use numbers when signing contracts. Looking back, we will find that naming numbers is not a patent of the Yuan Dynasty people, but a long-standing custom. I have an adoption document from the Northern Song Dynasty in my hand. The adopter's name is Shi Sixan. Like Zhu Chuyi, Chang Wuwu, and Zhang, this name is also a number. As for whether it comes from the age of his parents or the ranking of his brothers, I'm afraid you have to ask Shi Sisan himself to know. I also have a copy of "Yuan Dian Zhang" in my hand, which was compiled by several famous officials in the Southern Song Dynasty. Many parties in civil cases have their names numbered. For example, one judgment mentioned that a person is called by a surname, a surname, a surname, a surname, a surname, a surname, a surname, a surname , one surname, one surname, one surname, one surname, one surname Later, the man with that surname died, and his wife Zhang remarried a man surnamed Hu, and gave birth to two daughters, Hu and Hu Wu.
Later, when Zhang's son Ji Zu grew up, he married Cao again, and Cao gave birth to another son named Jiu. If Zhang is regarded as the ancestor of this family, then the descendants of this ancestor are named after numbers in addition to the official name of their ancestor. Very exaggerated. Now we can conclude that naming people by numbers is a custom, at least in the Song Dynasty. People in the Yuan Dynasty just followed this custom, not because of official coercion.