The Orf geneolgies in the US are an interesting patchwork of immigration.
The largest group of close related Orf's are descendants of the 5 brothers whose father died in Eisenach Germany.The brothers immigrated along with 3 sisters and their mother now married to a Heller in 1840/41.The second oldest brother Joseph Bastien Orf was my Great Great Grandfather.
I do have good geneolgies of the descendants of three of the brothers Johanne, Joseph and Ludwig. But of the other two Carl and Georg I have nothing.
Clarence Orf of Oklahoma does not fit any pattern that I have.I do have a distant cousin Ray Orf who lives and raised his family in Oklahoma but no Clarence.
I also have genologies of other Orf lines that go back into 17th century Germany and immigrated to the US independently and have no knowledge of each other or my Orf lines.
There appears to have been various Orf's that immigrated at various times and have no knowledge of the other families and no close relationship.Some were Lutheran and others like my family were Catholic.All from what became East Germany.The only Austian connection I have found is the large radio and TV complex call ORF.