The Jacobs that werein eastern Pa. during the 1800 were very rigid Jewish family my aunt told me they turned most of the children away from the religion. The ones I've heard of has biblical names, like David, my grandfather,Joseph his brother and Levy whom I think was my g.grandfather; I was told by my aunt that my g.g.grandfather was Jewish and came from Russia .That's all I really know, no American Indian on my fathers side.