The following data is extracted from Genealogy and Biography of Ontario County, New York.
Jacob (2), son of Jacob (1) Vanderhoof, was born in Orange county, New York. In 1790 we find the following heads of families of the name in Orange county: Thomas with two sons under sixteen and three females; Jacob with two females; Cornelius with two males over sixteen, four under that age and one female; Jacob Jr. with two males over sixteen, one under sixteen and two females. There was also a Cornelius and Peter Venderhoof, of New York, both doubtless descended from the pioneers, Jacob or Cornelius.
Source: Genealogy and Biography of Ontario County, New York