An early version of the name was Rathermann, which eventually became Ratermann.
 
Seems that many entering this country ended up with an extra 't' in the middle, both Rattermann and Ratterman. There is also the Raterman variation.
 
This site was originally set-up to show the descendants of Herman
Gerhard Ratterman (H G). With recent research, his ancestors have been found, and also the relationship to other Ratterman branches that migrated to this country.
 
We've added charts for many that settled in other locations.