My grandmother's sister was Cora Vander Tulip who married a Gerrit Vandersluys in South Holland. I would guess that her name in Dutch was translated to Cora in English. Cora Vander Tulip came from Stad aan't Haringvliet, Overflakkee, South Holland so I would guess that Gerrit was from that area too. They lived on Madison Avenue, Paterson, Passaic County, New Jersey and had a daughter Mary (1889) that worked for the Manhattan Shirt Company in Paterson. They also had a son Leonard and a son Edward (1898). Ed married a Florence Murtaugh and had Cora (1923) Edward and Florence. Hope I have been of help. Let me know what info you have on the Vandersluys family in Passaic County.