William O'Brien
William O'Brien (2 October 1852 – 25 February 1928) was an Irish nationalist, journalist, agrarian agitator, social revolutionary, politician, party leader, newspaper publisher, author and Member of Parliament (MP) in the House of Commons of the United Kingdom of Great Britain and Ireland. He was particularly associated with the campaigns for land reform in Ireland during the late 19th and early 20th centuries as well as his conciliatory approach to attaining Irish Home Rule.
Darby O'Brien
William D. "Darby" O'Brien (September 1, 1863 – June 15, 1893) was a Major League Baseball player in the late 19th century. He played outfield for the New York Metropolitans in 1887 and the Brooklyn Bridegrooms/Grooms from 1888–1892. O'Brien developed lung problems during his playing career and continued to play, despite his ill health. When he reported to spring training for the 1893 season, the team found that he was too ill to play and sent him to Colorado to try to recover. They played a benefit game to raise money for him.