John Towner Williams--one of the most widely recognized composers of film scores. As of 2006, he has received 45 Academy Award nominations, an accomplishment surpassed only by Walt Disney.
John Joseph Travolta - (born February 18, 1954) is an Academy Award nominated American actor, singer, and dancer.
John (Johnjo) O'Neill. Well known racehorse trainer and bookie's nightmare.
Susie O'Neill - Olympic swimming Champion
Luke O'Neill - Famous character from The Thorn Birds by Colleen McCullough
Thomas "Tip" O'Neill - Former US Speaker of the House
Matt Damon - another actor
Johnny Damon--current NY Yankees center fielder
Johnny Cash - Country & Western singer
Johnny Horton - country singer
Johnny Farnham - Popular Australian singer
Sally James Farnham -- noted sculptor.
Alec Baldwin -- one of the Baldwin bros actors.
Stanley Baldwin--1st Earl Baldwin of Bewdley, KG, PC (3 August 1867-14 December 1947) was Prime Minister of the United Kingdom on three separate occasions