Shannon

Shannon derives from the Irish Sionainn, the traditional name of the River Shannon, Ireland's longest river. The river name is connected to the Old Irish word sionn, possibly related to a root meaning old or ancient, and is associated in myth with Sionann, a granddaughter of the sea god Manannán mac Lir who sought wisdom at a sacred well. The name came into use as a given name primarily in the twentieth century, especially in English-speaking countries with Irish heritage, and is used for both girls and boys though it skewed predominantly feminine over time. Related forms include Shannen and Shanna.