Likely, (Polish spelling), Szmul Szwarc or any name including szwarc (like, Szwarcberg, Szwarcman, Szwarcenbaum/Szwarcenboim, etc.).
The German spelling is Schwartz/Schwartzberg/Schwarcman or Schwartzmann, etc. 
Samuel could have been Szmul, Szmul, Szmul.
However, the first name might have not been a precise translation of Samuel, and you may consider other names with the same initial (Szaia, Szya, Shaja, etc.

Dr. Joanna Zimmerman