Not necessarily, because "van" is much more common in Dutch names than "von" is in German names. (One reason for this is that "von" used to be restricted to Ge

Not necessarily, because "van" is much more common in Dutch names than "von" is in German names. (One reason for this is that "von" used to be restricted to German nobility, while there was no such restriction for "van", and as a result "von" is still relatively rare in German names.) Additionally, "van" and "von" are possessive pronouns in Dutch and German respectively, which might explain why they are used (e.g. "iPod van Mike" means "Mike's iPod" — the owner may still be Dutch but "van" is not part of his name). Again I think this is relatively less common in German, where the genitive case could be used instead.