I'm making a bigger effort in researching CHAMUDIS because I think it's an unusual name. On the other hand, I've been told by Russians I know that LIBEDINSKY is a common surname.
There are many Libedinsky in Argentina. I met one of them who has an extended family tree and I've been trying to find the connection to my family but without success, yet.
My grandfather Paltiel Libedinsky came from somewhere near Odessa. He migrated to Argentina, where Paltiel became Pablo and from there moved to Chile.