Murphy is an Anglicized version of two Irish surnames: Ó Murchadha/Ó Murchadh ("descendant of Murchadh"), and Mac Murchaidh/Mac Murchadh ("son of Murchadh") derived from the Irish personal name Murchadh, which meant "sea-warrior" or "sea-battler". (Muir meaning "sea" and cath meaning "battle").

Spelling variations include Murphey, MacMurphy, MacMurrough, O'Morchoe and others. In modern Irish, "Ó Murchú", rather than "Ó Murchadha", is used.

Murphy is the most common surname in Ireland and the fifty-eighth most common surname in the United States.

Keira Christina Knightley ( /ˌkɪərə ˈnaɪtli/; born 26 March 1985) is an English actress and model. She began acting as a child and came to international notice in 2002 after co-starring in the film Bend It Like Beckham. From 2003, her appearances in the Pirates of the Caribbean film series took her to much greater prominence. In 2008, Forbes claimed Knightley to be the second highest paid actress in Hollywood, having reportedly earned $32 million in 2007, making her the only non-American on the list of highest paid actresses.

Knightley has appeared in several Hollywood films and earned nominations for the Academy Award for Best Actress and Golden Globe Award for Best Actress for her role as Elizabeth Bennet in Joe Wright's 2005 adaptation of Jane Austen's novel Pride and Prejudice. Two years later she again was nominated for the Golden Globe Award for Best Actress, as well as the BAFTA Award for Best Actress in a Leading Role for her performance in Atonement.

Knightley was born in Teddington, London, England, the daughter of Sharman MacDonald, an award-winning playwright, and Will Knightley, a theatre and television actor. Her father is English and her Scottish mother is of half Welsh ancestry. She has an elder brother, Caleb.^{[citation needed]}

Christopher Whitelaw "Chris" Pine (born August 26, 1980) is an American actor. Best known for his role as James T. Kirk in the 2009 film Star Trek, he has also appeared in films such as The Princess Diaries 2: Royal Engagement (2004), Just My Luck (2006), Smokin' Aces (2007), Unstoppable (2010), and This Means War (2012).

Pine was born in Los Angeles, California. His father, Robert Pine, is an actor who appeared in CHiPs as Sergeant Joseph Getraer, and his mother, Gwynne Gilford, is a former actress who is now a practicing psychotherapist. He has an older sister, Katie. His maternal grandmother, Anne Gwynne (née Marguerite Gwynne Trice), was a Hollywood actress, and his maternal grandfather, Max M. Gilford (born Max Goldfarb), was an attorney who was elected president of the Hollywood Bar Association. Pine's ancestry includes Jewish (from his maternal grandfather), Welsh, and English. He has stated, "I definitely have a spiritual outlook... I am not a religious guy, I am probably agnostic".

Rachel Anne McAdams (born November 17, 1978) is a Canadian actress. After graduating from a four-year theatre program at York University in 2001, McAdams initially worked in Canadian television and film productions such as My Name is Tanino, Perfect Pie (for which she received a Genie Award nomination) and Slings and Arrows (for which she won a Gemini Award). Her first Hollywood movie was the 2002 comedy The Hot Chick. McAdams found fame in 2004 with starring roles in the teen comedy Mean Girls and the romantic drama The Notebook. In 2005, she appeared in the romantic comedy Wedding Crashers, the psychological thriller Red Eye and the family drama The Family Stone. She was hailed by the media as "the new Hollywood it girl" and received a BAFTA nomination for Best Rising Star.

However, McAdams withdrew from public life in 2006 and 2007. During this time, she turned down leading roles in high-profile films such as The Devil Wears Prada. She made a low-key return to work in 2008, starring in two limited release films: the film noir Married Life and the road trip movie The Lucky Ones. She returned to prominence in 2009 with appearances in the political thriller State of Play, the science-fiction romance Time Traveler's Wife, TheThe Time Traveler's Wife and the action-adventure film Sherlock Holmes. McAdams's first star vehicle was the 2010 comedy Morning Glory. In 2011, she starred in Woody Allen's romantic comedy Midnight in Paris and made a cameo appearance in the action-adventure sequel Sherlock Holmes: A Game of Shadows. McAdams starred in 2012's romantic drama The Vow, and will next appear in Terrence Malick's To the Wonder and Brian De Palma's Passion.