Is that the 1850s or 1950s?? The Van Valkenburgh/ Van Voltenburgh family had folks in Jones Co, IA, in the 1850s timeframe. There were other VVs in other parts of IA and I think still are. There is at least one descendant of John Tayler VV--I think but don't hold me to it. Again I suggest contacting NAVVF website:
www.van-valkenburg.org.