David and Christiana "Belov" were in 1860 census in Greenfield, Wayne, Michigan. They may be ...probably....the same family listed as "Barlow" 1870 census, same place. I am hoping that this might ring a bell for someone familiar with either the family or the locale. I have looked at maps and found three or four towns that it could have been....their pronunciation was probably difficult for the census taker.
The 1860 census has "Gy" for Germany; later census "Prussia".