Hi, You haven't said which spelling you were looking for. Yes, there are many different spelling for surnames and I have found it depends on which family member changes his surname spelling at the point of entry into the US. Then again, a sibling of that family can also change it later on down the line, but I have not found the generation of kids around the 1900's change their spelling.
So anyway, I have a KUFAHL, Loring H. born Feb 15, 1899 in Wheaton, Pottawatomie, Kansas married to Irene Christine Bosse. You will find this Kufahl family living in Wheaton, Kansas. Loring's parents are William Fredrich Kufahl b 1865 in Germany and Bertha L. Berges b 1874 in Onaga, Kansas.
Maybe I have helped and maybe I haven't.
It depends which spelling you want to follow, I think.
I have not followed William and Bertha's children's lines.
If there is anything I can follow up on, email me at
dljjkb@gwtc.net. Joan