Jacob (James Jackson) Bebarfald - Surname of Jacob

Not sure but one would assume it was an attempt to hide his Jewish ancestry https://en.wikipedia.org/wiki/Anglicisation_of_names

@ Jacob (James Jackson) Bebarfald -surname of Jacob

Halfdan Hansen is correct .Jackson was their middle name and during WW1 Bebarfald was dropped . Leslie James Jackson enlisted and just took the name Jackson mainly because it was a German name and he did not want to be deemed as a descendant of the Germans when he went .