choroba, there are so many rules about names I do not think I can cover them all. I did not cover van/von either. Depending on the country one where the name is being filed, van Helsing could be filed under H (Netherlands and Suriname) or V (Belgium). Van is also a Vietnamese middle name. The Dutch have a lot of surname prefixes which could be added to the surname. I am sure there are other rules I have missed. There are a whole slew of nobiliary particles each with their own sort rules I imagine.
Have a cookie and a very nice day!