My maternal grandfather, David Rosenberg, and his father, Abraham Rosenberg, came from Piotrkow, Poland  His ancestors, Chaskiel and another Abraham, came from the village of Ujazd, Poland. 
My paternal grandfather, Harry Schupak and his family came from the Warsaw area.
Is anyone familiar with these names or towns?

Shalom,
Carin Schupak Miller

Hello,

You can see the descendants of Movsha Shupak (1817-?) at https://www.amitys.com/webtrees/individual.php?pid=I22862&ged=Gedcom.ged. His grandson Simon Schupak (1881-1960) settled in Finland. The family was presumably from Lithuania. At the same site you can see several Rosenbergs, among them Abraham, born 1848.

Best regards,

David Seligson