Where? I've never heard it once in my entire life, the only place I've ever seen this is in VNs. In school the last name was always used, in the various jobs I've been in, it was last names, the first name has never been used. I have to assume this is specific to certain cultures or languages.
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" We use a title (
Mr,
Mrs,
Ms,
Dr,
Prof) and the surname in more formal situations. We don’t usually use the title alone, or the title and first name (although we sometimes use a job title) "