It is Rio.
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.
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.
bang
Allfie.
The girl's name with the shortened form Tina is typically Christina.
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.
Scott Brazil's birth name is Scott Beaird Brazil.
Brazil.
Sure, why not?