Jon Lennon was never known or referred to as John Ono.
John did change his name from John Winston Lennon to John Ono Lennon
He has two. His full name is Sean Taro Ono Lennon.
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Sean Lennon's birth name is Sean Taro Ono Lennon.
Musician Sean Lennon is the son of John Lennon and Yoko Ono.
Yoko Ono's real name is Yoko Ono Lennon. She was born to Isoko Ono (mother) and Eisuke Ono (father) on the 18th of February, 1933.
Yoko Ono.
John Lennon was born John Winston Lennon (with "Winston" coming from then-Prime Minister Winston Churchill), but he hated his middle name.After he married Yoko Ono in 1969, a discussion between the two about how women changed their names for their husbands (she became Yoko Ono Lennon upon their marriage), but men didn't change theirs for their wives, prompted Lennon to change his middle name to Ono.Under British law he could not technically drop his middle name, but he could add a new one, so he became "John Winston Ono Lennon" for legal purposes (including his "green card" in the United States). He otherwise gave his "full name" as John Ono Lennon, and did so for the rest of his life.His name is John Winston LennonHence the nickname Dr. Winston O' BoogiJohn Winston Lennon which later he took on his wifes name and went by John Ono Lennon.John Winston Ono Lennon.
Yoko Ono Lennon
Sean Ono Lennon was born on October 9, 1975 and Julian Lennon was born on April 8, 1963.
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Kyoko Chan Cox, born in 1963 to Ono and Anthony Cox. She later adopted the name Rosemary.