MacGinn and the form Maginn are approximately equally numerous and are found today respectively in counties Tyrone and Down. MacGinn, or MacGinne, is listed in the "census" of 1659 as a principal Irish name in the barony of Oneilland, Co. Armagh. Mag Fhinn in Irish. This is anglicized MacGing, or Ging in the three Connacht counties of Mayo, Leitrim and Galway. In Mayo, the variant Mac Fhinn, becomes MacKing, is also found, but if not obsolete it is now very rare. William Maginn (1793-1842) left Dublin in 1828 and became one of the foremost personalities in the literary and journalistic field in London. Edward Maginn (1802-1849), a Tyrone man, was coadjutor Bishop of Derry and a staunch supporter of the more extreme Nationalists of his time.