bra
It is Rio.
The shortened name for oxygen is O2.
Jon is most often the shortened name for the proper name Jonathan. However, it can be a shortened name for some other proper names including John and Jonas.
it actually is shortened from Christina and it means ' christs follower'
Christopher Katherine shortened to Kitty shortened to Kit
I guess you mean Rio, which comes from Rio de Janeiro the full name of the city. It's hard to shorten Lima or Brasilia any further. Other cities could be Salvador or Aracuja
Scotland can't be abbreviated, But the name of the Scottish people can be shortened to Scots.
Allfie.
bang
Yes, a shortened version of your name is called a nickname. An example of a nickname for the name Jessica is Jess. There is also a pet name which doesn't have to be a shortened version of your name. A pet name can be a nickname like Jess or it can be something like "kitty" for the name Olivia.
Kilometers = km
Prose