In Belgium too. For example Baron Jean Van Gysel de Meise. I know him from horse shows. He doesn't introduce himself as 'Baron' but it is van Gysel.
An acquaintance of mine once said that he (and others) only discovered that a (study) friend was a baron, because they needed his passport data for a trip. The passport stated that he was a baron. Fun, but nothing special, their friend would still be the same.
In my college years, there was a fellow student who usually only mentioned part of her name at introductions. Apparently she did this, to make not directly clear to others that she was of noble birth and that her father was a well-known regional high administrator. She still included the 'van' part, but let another part of her double name out. I didn't think much of it at first, in my opinion she was just who she was. A nice girl who you could laugh with, but who could also be substantiated and critical. But later I started to understand when I saw exaggerated reactions from others to her (full) name and parentage.
A few years back there was an interesting program on Dutch television: De HokjesmanDe Hokjesman is a Dutch television program of the VPRO by program maker Michael Schaap, presented by himself and Jurjen Blick as the man behind the scenes. The "box man" is fascinated by the prevailing box spirit (de hokjesgeest) in the Netherlands versus beyond, while Dutch society is far from homogeneous. The main theme is the subcultures in the Netherlands. The program maker examines the environment of those who are part of it, how they relate to other people and what is common, looking at which written and unwritten laws, rules, codes and taboos they know, what qualities they have in their manners and how they live and survive today.
One of the groups he once had a closer look at was the Dutch nobility. Very interesting, also because of some contradictions within the group (and its members).https://www.vpro.nl/speel...e-adel-de-hokjesman~.html