Re: German Jewish Community: Grötzingen, Alb-Donau-Kreis, Baden-Württemberg, Germany or Grötzingen, Durlach, Baden, Württemburg #germany
According to the German wikipedia, there are three places called Grötzingen, all in the state of Baden-Würtemburg.
One of them is next to Durlach, on the outskirts of Karlsruhe. One is in Alb-Donau-Kreis not far from the city of Ulm, and the third is part of the town of Aichtal, roughly midway between the other two.
You'll need to assess your sources to decide which is the correct one, or perhaps you could reach out to the local archives to see if they have any trace of your ancestors family.
I hope this helps,