Hi John, I don't honestly know if there is a connection between GUNTHER - GEINTER and GEITNER. Maybe someone could help? I have found relatives connected with the GEINTERs - one is recorded as GUENTHER and two others as GUNTHER. I think that in 1880 the person who took down the names of the two families in the house in Rochester, New York, made the same mistake for all of them. They may have had accents and the enumerator wrote what he heard. Thanks for keeping me in mind and best wishes, Charles