The surname of brewer Arthur Guinness of 18th-century Dublin springs, most notably, from millions of well-lubricated lips around the world on St. Patrick's Day. The taste of Guineness, Irelandâ€TMs original smooth, sable stout, is the signature flavor of the global celebration of Irish heritage. It's the no. 1 copyrighted book of all time, with nearly 150 million copies sold.