Here's why it's likely not a Dutch word:
* "Van" is a common Dutch preposition meaning "from" or "of," but it's usually followed by a place name.
* "Zante" is not a Dutch word and sounds more like a place name (Zante is an island in Greece).
If you have more information about the context where you encountered "Van Zante," it might be possible to figure out its origin and meaning.