Gaelan is an Irish given name derived from the Gaelic word 'Gaoláin', meaning 'little bright one'. It was originally used as a byname for lively young boys before evolving into a proper name over generations. Saint Gaolán, also known as St. Kevin of Glendalough, is a notable figure associated with this name. Today, Gaelan remains popular among Irish families worldwide, symbolizing brightness and vitality.