And in Chinese nobody would be confused about whether his family name was Xu or Cheng. Also reasonable: "I am Doctor Xu." "I'm Xu Cheng. I prefer my students

And in Chinese nobody would be confused about whether his family name was Xu or Cheng. Also reasonable: "I am Doctor Xu." "I'm Xu Cheng. I prefer my students to call me Doctor Xu." "Hi, everybody calls me Frazz. Here's my card if you need to reach me."