Hello-
I know this is an old thread but I just found it today. The surname you are looking for is also spelled Gehman or Gehmann. I am from PA and descended from Christian Gehman who left Switzerland in the 1700's. He went to Germany for a while near Heidleberg before some of his sons set sail from Rotterdam to Philadelphia around 1735. Currently I am on my lunch break at work so I don't have all the info. There were 3 Gehman brothers who came here with their families. Christian Gehman had at least 3 sons who sailed from Rotterdam and I am descended from his son also named Christian. There is a man in Michigan named Paul Gehman who has done extensive research on the Gehman name and he has traced the 3 brothers and was working on more when I last heard from him.
My husband was in the US Army and we were stationed in Germany. I ran into a young man in Mannheim (near Heidleberg) Germany with the last name Gehmann. I'm sure he is a distant relative but he did not speak English and I do not know enough German tell him that we were related without sounding insane.
Although you spell the name differently I believe we all originated from the Swiss family. In the book I have at home the name of the town is given along with the original spelling of the surname and some back history.
Please contact me if you want more info at
bryn1240@hotmail.com