Holland was a county in the past, Utrecht a diocese, Brabant and Gelre Duchy's, etc (not that there is any real difference between those terms ). Netherlands is the current nation state that bonds all people living in it's provinces. Doesn't mean they are more alike compared to people from different nations in the United Kingdom
Anyhow I don't think it means anything. I'm genetically from Limburg as both of my parents came from there, but met each other in Utrecht. So by birth I'm Utrechter. And by conviction I'm cosmopolitan