Keira is a female given name. It is an Anglicized version of Ciara, the name of a 7th-century saint, and means 'dark' in Irish Gaelic.
Keira Christina Knightleyis an English actress and model.[She began acting as a child on television and made her film debut in 1995. Knightley had a supporting role as Sabé in Star Wars Episode I: The Phantom Menace (1999) and her first significant role came in The Hole (2001). She gained widespread recognition in 2002 after co-starring in the film Bend It Like Beckham and achieved international fame in 2003 as a result of appearing as Elizabeth Swann in the Pirates of the Caribbean film series (2003–07).Source:Wikipedia