He didn't change it but shortened Chinualumogu to Chinua. Shortening names without leaving any doubt of it's meaning is very common in the Igbo ethnic group from which he hails.
The long forms are generally written on birth certificates and passport while short forms are used in the home and everywhere else.
because albert chimmichanga was much too long, so he changed it to chinua
Chinua Achebe's original name was Albert Chinụalụmọgụ Achebe. He adopted the name Chinua as a way to embrace his African heritage and reject the colonial influence of European names.
The Sunday Times of London named Chinua Achebe as the 'The Father of African Literature.'
Albert Einstein's "real" name was Albert Einstein. He had no other name.
it name was Albert
Albert Bear's birth name is Albert Arnold.
Albert Warner's birth name is Albert Eichelbaum.
Albert Petit's birth name is Albert Petitmaitre.
Albert Paulsen's birth name is Albert Paulson.
Albert Miniaci's birth name is ALBERT MINIACI.
Albert Hague's birth name is Marcuse, Albert.
Albert Grobe's birth name is Albert A. Grobe.