Nelson Mandela is known as "Madiba," which is the name of the Xhosa tribe to which he belongs. It is considered an act of honor to refer to somebody by the name of his tribe.
According to Who2 Biography, when writing about the history of Nelson Mandela:
He is also called 'Madiba,' a nickname taken from his clan... Mandela says in Long Walk to Freedom that he was given the English name "Nelson" by his teacher on his first day at school.
madiba
Paul Madiba was born on 1992-07-29.
Moses J Madiba has written: 'Tsiri'
Madiba
Nelson mandela was called Madiba as his nickname
mandela
he got the English name nelson from his teacher
Madiba, Nelson Mandela!
Nelson Mandela
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Nelson Mandela went by Madiba.
Yes, but I prefer Luna