That may be your experience, but it's not universal. My surname is 'Van den Brande' (yes, capitalized like that please). It's a very, very common name, pages and pages of it in the local phonebook. My daughter's surname is 'Van den Brande - Isaacson'. It would be nice if programmers could get it right, it's just a string after all.

(PS Not our actual names, but they follow that pattern).