Position of infixes of names (e.g. “van”) in bibliographies
Unfortunately, it's complicated.  The proper organization and alphabetization of names is dependent on the identified nationality of the person in question.  Thus, a German "van" name is handled differently than a Dutch "van" name.  It may change further again upon immigration, e.g., Americans of Dutch or German origin typically follow English conventions or even remove the space.

Here is a nice guide to navigating these muddy waters, as well as a question from the German Language SE.