Fascinating family history. Hopefully you’ve had the chance to revisit the old neighborhood.
Our oldest daughter studied in Sweden during her junior year in college about 17 years ago. She actually took the time to visit Gdansk and find the old family home! She sent me photos and it looks the same as a 1900 photo I have of the building. She talked to some locals and a few of them thought they remembered the family name. It’s Polish “Gdansk” now and all the Germans were kicked out in 1945 after having been there since 1200.