You be looking for the Coat of Arms!
There is a Gerrit "Jansen" Van Vorst in the book "New York under the Dutch" at GOOGLE BOOKS which can be read online free. Killed while thatching roof.
Often mistakes and confusion lead to name changes. It may be very possible that be looking Jans/Janse/Jansen/Janssen a last name with some connection with (van/van de(r)) Vorst/Voorst
The key may be through Geertryd/Geertruyd/Geirtrude Jacobs/Jacobsz.
Let me know if you need help?