Niscemi is a little town and comune in the province of Caltanissetta, Sicily, Italy. It has a population of 27,558. It is located not far from Gela and …Niscemi is a little town and comune in the province of Caltanissetta, Sicily, Italy. It has a population of 27,558. It is located not far from Gela and Caltagirone and 90 km from Catania. The name Niscemi is derived from the Arabic word نَشَم neshem or its singular form نَشَمَة neshemeh, this being the name of a particular type of tree.