Giersh may be another spelling for Herz/Hirsch.
Naphtali Herz is a common combination of names.

Joe Hirschfield
Portage MI
HERSZFELD, HIRSCHFELD, BUXBAUM, BUCKSBAUM, BUCHSBAUM, LINDENBAUM-Skwarzawa
(Skvaryava), Sielec Bienkow (Selets), Glinyany, Jaryczow Nowy (Novyy
Yarychiv)-GALICIA
MINOWICKI, MINOWITZKI, TOBIASZ-Brest Litovsk, Wysokae-Livovsk-BELARUS