The word 'von' basically means-'from'.
For example Dieter von Velt-means Dieter from Velt,in other words this is where this person originates from or where that person has there ancestral routes,much the same as in Scotland and Ireland where 'Mac' or 'Mc' means son of,the word 'von' is too define where a person is from-von sound a little the same hey.hope this helps as I am Scottish but live in Germany and speak German.
For example Dieter von Velt-means Dieter from Velt,in other words this is where this person originates from or where that person has there ancestral routes,much the same as in Scotland and Ireland where 'Mac' or 'Mc' means son of,the word 'von' is too define where a person is from-von sound a little the same hey.hope this helps as I am Scottish but live in Germany and speak German.