In the 1870 census I found a German Catholic Orphan Asylum in PA that lists a Henry, Peter and ? (now I dont remember) maybe it was John, but the last name is indexed as Jarnn or something like that and I took a look and think it could actually be Jarcow. I thought this may come in useful to someone so take a look and see what you think.
p.s. Still searching for George Joseph Jarchow in the 1870 census. May have immigrated abt. 1866-1868 from Germany. Born 1856 in Darmstadt Germany according to 1880 census. Any help appreciated.