In fact, there is no problem in language application. Take Chinese as an example. If you call him Xu Xiake, on formal occasions, others will call him Mr. Xu or Mr. Xu Xiake. If people are familiar with him, they may laugh at him.

If the name is Rachel Green, officially, others are called Ms Green or Ms Rachel Green in full name. In the appointment of a company, Mr./Ms. is usually announced in full name, followed by Mr./Ms.+surname.

translate freely

Mr (short for Mr; Used before a man's surname, first name or position, as a title for a man without a title, or as a title used with an official position, title, etc. Mr. White and Miss Brown have announced their marriage.