Then why were there 'DONABAUER' names in Austria back in the early 1800's? we found them in old Catholic church records written in German. i thought perhaps both Donnerbauer AND Donabauer dirived from "DONAUBAUER" which means Danube Farmer. all three names existed in the 1800s europe surrounding the Danube river where Germany/Austria/Czech border meet. that's why i'm having a hard time tracing my great grandfather. in the church books he and his mother's name was spelled Donabauer. but in America he spelled it Donnerbauer. perhaps mispellings in the church books? any thoughts?