I am descended from a Vanston from Devon. My g-g-g-grandfather was Christopher Vanston, from Tavistock, born in the early 1800s. The family story is he was a shipwright.
He married a Mary Dougherty and emigrated to Newfoundland. Do not have any death dates. Their children (born in the 1840s) mostly emigrated to the United States including Samuel Vanston (c. 1843-1905) (d. Scranton, PA), James Vanston (c. 1848-1904) (d. Scranton, PA), Katherine Vanston Walsh (c. 1842-1915) (d. Wilmington, Delaware), and Thomas Vanston (c. 1846-1894) (d. Butte, Montana).
I have heard the Flemish/Holland/William of Orange stories too, but have seen no proof of them - my impression is that (some!) family history researchers were a more fanciful bunch before the internet, and everyone loves a good story.
I would love to connect to other Vanston lines if its possible.