Why do Buddhist monks have to write down their names?

In the Buddhist circles in modern China, due to the habit of avoiding or not addressing the teacher directly, when addressing the master or addressing the monk respectfully, it is often called "up-down-up". For example, Master's Buddhism is called "Virtual Cloud" and "Upper Virtual Cloud". Therefore, when asking the legal names of family members, the word "Shang Xia" is usually used, for example, "What's your name, master?" Sentence, in which' up and down' refers to the dharma name. In addition, the Buddhist names of monks often include Neihao and posthumous title.