We have traced our Thierolfs to Hesse, Darmstadt Germany area so far. We are still trying to link with other Thierolf's from that area so we acn trace back farther. My Great grandfather was born in 1843 in Darmstadt Germany and came to America around the late 1800's. My brother has contacted some Thierolfs in Germany but so far we have not been able to link the 2 families. I will let you if I find more!