I whanau a Keira Christina Knightley i te 26 o Poutu-te-rangi 1985, i Teddington, London, ki nga kaiwhakaari whakaari a Sharman Macdonald raua ko Will Knightley. Ko tana whaea he uri no Scotland me Wales, ko tana papa he Ingarihi. I whakauruhia ia ki te ingoa "Kiera", te ahua Anglicized o "Kira", he ingoa i whakaaweawehia e te kaitakaro hukapapa o Ruhia, a Ivanova, i whakaarohia e tana papa. Heoi, i he a Macdonald i te ingoa i a ia e haere ana ki te rehita i tana tamahine, ka tuhi i te "e" i mua o te "i". He tuakana ta Knightley, a Caleb. I mahi ano a Macdonald hei kaitakaro whakaari i muri i tana mahi hei kaiwhakaari. I whakauruhia e ia ana tamariki ki te ballet me te poipoi i te wa o te tamarikitanga. I te wa e ono ona tau i tae atu ai ia ki te Whare Wananga o Knightington, i whakauruhia ia e tana whaea ki te mahi whakaari i roto i te Whare Wananga o
mahi