Rather than attempting to unravel this, I would heartily suggest that you visit the Arner website at www.geocities.com/~erner/gen/arner
On the first page, there is a spouse surname index. Click on the section that contains "F" then scroll down to find the Fohl name. If you then click on the Arner/Orner link, you will go directly to the page(s) that pertain.
Joe Erner, the custodian of the site, is a wonderful resource. His email is on the site.
Good luck in your research.