My son, Jacob Harold Isenberger ran across this posting and wondered if it was part of our clan. Generally speaking if the name is spelled the same we are related somehow. My Grandfather and Great Grandfather were both Jacob Oscar Isenberger. The next generation back was George H.Isenberger born in 1819 in Maryland and married to Deliah Powers born in 1824 in Pennsylvania. The first Jacob Oscar was born in Pine Creek Illinos in 1858 and moved to Burt Iowa where the next Jacob Oscar was born in 1889. My father and siblings were born in Burt. Dad was three years old when they moved to Stanley WI. The limited information I have does not include a Jacob married to Rachel. I sent the information to my dad to see if it would jog his memory. I also have an aunt who has done quite a bit of research on the family and she may have some information for you.