Brian O'Driscoll was born on 21 January 1979. He was Irish national and known as Rugby union player.
Tony O'Reilly was born on 07 May 1936. He was Irish national and known as Rugby Player.
Henry Charles Keith Petty-Fitzmaurice, 5th Marquess Of Lansdowne was born on 14 January 1845. He was Irish national and known as Government Official.
Manus O'Donnell was born on . He was Irish national and known as Government Official.
