Hi Matthias. At the moment I’m indexing the marriages books from Schwientochlowitz office register. I found one interesting name in year 1906: Francesco Giovannie Cappelletti. So there was at least one Italian in the Upper Silesia. 🙂
Perhaps some of the Italian troops in 1921 during Upper Silesia plebiscite started family’s here? Maybe some of our society historians could help.