Most everyone has nicknames. The wikipedia says they can be short, clever, cute or otherwise substitue for a person's name. I have my fair share of them. The various spelling attempts of Nicky throughout school to try & be cooler, ie: Nikki. Then my failed attempt to go back to Nicole when I first started a 'real job' to sound more 'professional'.
Well - to a small crowd in central NY & Albany, I am known as 'big bird'. I am blessed with this name b/c my little brother ('bird') used to play quarterback on the high school football team. His long passes sometimes would resemble 'flailing ducks' in flight, to which someone cleverly thought to call him 'bird'. My little sister got dubbed the short, cute, and otherwise substitue 'little bird'.
There, now it's been written down. It will go down as 'Cunha folklore'.
(how professional is that?!)