Because his sister called him buzzer while trying to call him brother :)
Aldrin had said in 1969 that he got the name Buzz , by his younger sister who failed to say brother. It always came out as buzzer.He got it from his sister who called him Buzzer instead of brother.
Before going to the moon Edwin Buzz Aldrin was a pilot in the U.S A.F.
Yes, Buzz Lightyear is in fact named after the famous astronaught Buzz Aldrin, second man to walk on the moon
si sanorita