My maternal grandmother's last name was Fjerdingstad (Her full name was Elvira Berthe Ella...but she always went by Ella). She was born in Denmark in 1885/died in Sylvania Ohio in 1964.
I have been told that the family adopted the name while living on the farm in Norway a generation or two before my grandmother was born. They had fled France for Norway and then changed their name.
One of my grandmother's cousins was a silver smith in France named Christian Fjerdingstad. I have traced other Fjerdingstad's who also claim to be related to Christian, but in most cases there are flaws in actually fitting the connection.
My Grandmother's father was named Jules A Fjerdingstad. He died in Denmark during WWII.