I would say it is definitely a 2nd given name.
A Google search in Hebrew reveals that there are 2 graves on the Mount of Olives in Jerusalem with that name (as a given name). Also a death notice for someone else. All the deceaseds (or their families) are originally from Eastern Europe..
Sagan/Shagan family from Veliuona (Velon), Lithuania
Goldberg family from Vidukle, Lithuania
Susselovitch/Zuselovitch family from Raseiniai (Rossein), Lithuania