I have tracked as many KARLIN, KARLINSK(I/Y) and KAROLINSK(I/Y) families as I can from Belarus. We are from the Pinsk area; Motole, Yanove, Antipol and Pinsk itself.
What is their surname in the Revision List and what is their shtetl? If they had children who lived in the US, try comparing their gravestones with death certificates to see what was given as their father’s Anglicized name. It may also lead you to their parents’ graves which would help find dates of death.
Hope this helps.
JewishGen Researcher No: 459852