Dear Genners

The given name Gimpel is not a nickname (Kinnui) to the Hebrew name
Gamliel.

Gimpel or Gumpel is a nickname to Efraim and also to Mordechai.

The source for this names is in Germany in the 15 or 16 century.

The family name Gompertz or Gumperts get out also >from this names.

This names where used in the region what is called 'Nieder Rhein=E2' in
the west part of Germany.

Best regards

Ury Link
Amsterdam
Holland