What is the meaning of word Von in a name?

"Von" is a German preposition meaning "of" or "from". It's commonly used in German surnames, indicating the person's origin or ancestral place.

For example:

* Von Neumann: Of Neumann (a place name)

* Von Braun: From Braun (a place name)

Note: "Von" is not a title in the modern sense, though it was once associated with nobility. Today, it's simply a part of a name that reflects lineage.