Jean-Claude Van Varenberg (the real name of Jean-Claude Van Damme). It is incredibly common. I've got many several french speaking belgian friends, with a french name but a dutch family name.
> Is there a significant overlap between the linguistic communities of Belgium?
I would say not anywhere near what the name / family names may suggest. The north/south separation in Belgium is quite clear and although mixed french/flemish couples are by not means rare, I'd say the overlap is still not huge. Even in Brussels native flemish speaking people are only 6% of the population.
Jean-Claude Van Varenberg (the real name of Jean-Claude Van Damme). It is incredibly common. I've got many several french speaking belgian friends, with a french name but a dutch family name.
> Is there a significant overlap between the linguistic communities of Belgium?
I would say not anywhere near what the name / family names may suggest. The north/south separation in Belgium is quite clear and although mixed french/flemish couples are by not means rare, I'd say the overlap is still not huge. Even in Brussels native flemish speaking people are only 6% of the population.