Shannon Harbour has the older/regional name Cluain Uaine Bheag meaning 'Clononey Beg' or 'little Clononey' after the distance and population and low laying land of the area in comparison to the other side of a stream off the River Brosna, this townsland is called Cluain Uaine Mhor/ Clononey Mor/ 'Big Clononey'