Tags: Given Name, Name.
Shannon (wise river) is an Irish unisex name Anglicised from Sionainn. Alternative spellings include Shannen Shanon Shannan Seanan and Siannon. The variant Shanna is an Anglicisation of Sionna (possessor of wisdom).Sionainn is an Irish portmanteau of sion (wise) and abhainn (river). This is the Irish name for the River Shannon. Because the suffix ain indicates a diminutive in Irish the name is sometimes mistranslated as little wise one.