[1] https://www.independent.co.uk/news/people/china-s-president-...
[1] https://www.independent.co.uk/news/people/china-s-president-...
In all cultures.
To the downvoters: In all cultures happens and is considered normal, that doesn't mean everybody does it. I'm glad your family/circle of friends has a different tradition. This just means that when someone does it no one finds it weird. What is weird, is asking the president of another country for advice. That is weird in all cultures.
Quite the opposite, people tend not to divulge the chosen name until after s/he has arrived as it's less likely anyone will react in a way that might cause them to rethink their choice.
Your wife is Chinese and you have a baby on the way.
This invokes some topical conversation and builds rapport so you say, in jest and without any real intent to follow through, "We're still thinking about names. We have an idea for English but not Chinese. Mr. President, would you like to perhaps suggest a Chinese name?".
Attendees and translators smile, the ice breaks a little more, and they move on to something more substantial.
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It's lighthearted throwaway banter. Watch, or attend, a meeting of world leaders or business execs...generic blah-blah proceeds all meetings.