There is no rule that says a name cannot have two characters.
Name is a specific name symbol that humans give to each person to distinguish individuals. It is a symbol that distinguishes individual differences among groups of people through language and text information. Therefore, there are no corresponding restrictions on naming.
Names only appeared after language was produced. Various ethnic groups have many customs in determining people's names. This habit is restricted by many cultural factors such as history, society, and ethnicity. A person's name usually has a certain meaning. Because of names, humans can communicate in a normal and orderly manner, so everyone has a name of their own.