I apologise, I think Berka is more likely a nickname for Ber which could be interchanged with the Hebrew name Dov. Some gravestones in Bobruisk with the names Yisroel Dov or Yisroel Ber that were recorded as Berka made me realize my mistake.
--
Binyamin Kerman
Baltimore MD

Researching:
KERMAN Pinsk 
SPIELER Lodz, Zloczew, Belchatow
SEGALL, SCHWARTZ Piatra Neamt