Why is Buzz Aldrin called 'Buzz'?

Answer 1

This started when his little sister mis-pronouced the word' brother' as 'buzzer.' It was adopted and later shortened to Buzz. He later legally changed his name to 'Buzz'.

Answer 2

Buzz Aldrin legally changed his name from Edwin Eugene Aldrin Jr. to Buzz Aldrin in 1988. The nickname "Buzz" was given to him by his younger sister when she couldn't pronounce the word "brother" and instead said "buzzer," which was later shortened to "Buzz."