I had found the Hamburg list but not the NY passenger so thank you for that. Very helpful.
When you say wildcard, what does that mean?
I will definitely try the first 3 or 4 letters trick, never thought of that.
I have yet to find any obits for Jonas or Isabel. The family didn't have a lot of money so not sure if that would make a difference. I will keep looking though. That NY passenger list is the first I have seen perhaps a brother. I know my ggrandfather had a sister come over as well but she ended up going back and the suspicion is that she might not have made it through the Russian purge.