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.
Pat O'Brien (actor)
William Joseph Patrick O'Brien (November 11, 1899 – October 15, 1983) was an American film actor with more than 100 screen credits. Of Irish descent, he often played Irish and Irish-American characters and was referred to as "Hollywood's Irishman in Residence" in the press. One of the best-known screen actors of the 1930s and 1940s, he played priests, cops, military figures, pilots, and reporters. He is especially well-remembered for his roles in "Knute Rockne, All American" (1940), "Angels with Dirty Faces" (1938), and "Some Like It Hot" (1959). He was frequently paired onscreen with Hollywood legend James Cagney. O'Brien also appeared on stage and television.