Henry Jackson (originally: Yakov Glickman) and Irene Jackson (originally: Ida Glickman)
They are the couple Lev and Raisa talk to while waiting in line to enter the United States. Originally from Minsk, Belarus, Henry and Irene choose to change their names to fit better into the American mainstream. They believe that natural-born Americans did not want to hire people with "foreign"-sounding names, so they encourage Lev and Raisa to Anglicize their names.
This suggestion, of course, is shot down by Lev, who does not believe in changing aspects of himself to fit into society, as he and Raisa came to America to be "free."
The Abramovs' neighbour when Sam was a toddler, Mrs. Katz is a retired piano teacher who looks after Sam when his parents are at work. She had immigrated from Galicia, Poland, in the early 1890s, a few years before Sam's parents immigrated to America in 1898.
She is a kindly old lady who lets Sam do whatever he wants when he is at her place. She makes delicious food and is known particularly for her knishes.