John Lennon formally changed his middle name by deed poll from Winston to Ono, during a brief ceremony held on the roof of the Apple building at 3 Savile Row, London.
The ceremony was carried out before Bueno de Mesquita, Commissioner of Oaths. Lennon had never liked his middle name, which had been given to him during a bout of wartime patriotism.
Yoko changed her name for me. I've changed mine for her. One for both, both for each other. She has a ring. I have a ring. It gives us nine 'O's between us, which is good luck. Ten would not be good luck.
Technically, Lennon was unable to lose the Winston from his name, as UK law dictates that a person is unable to fully revoke a name given at birth. As a result, his official name became John Winston Ono Lennon, with the ten 'O's he wished to avoid.