Yes, it must have been in Germany where you saw „Herr“ and „Frau“ plus surname on a name plate. In Germany (as well as in France
) you don’t use a foreign person’s first name. People think it’s unrespectful and unfair to call a woman named Lisa
” when she’s a waitress and “Frau Müller” when she’s a businesswoman.
The trend though is that younger people more often use each other’s first names even though they don’t know each other, but they don’t make any differences (occupation, education etc.).