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Re:Foreign Minister Taro Kono to ask media to switch order o... by NotPaidToPost on Tuesday May 21, 2019 @05:42PM (#19975382)
Interestingly, in Chinese no-one would call him just 'Cheng'.
Re:Foreign Minister Taro Kono to ask media to switch order o... by dsr_ on Tuesday May 21, 2019 @06:19PM (#19975723)
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."