In two British films I recently recalled, I noticed a trend in nicknaming that I'd like confirmation of, by someone familiar with spoken Cockney English.
In the first one, Lock, Stock, and Two Smoking Barrels, I believe Barry the Baptist, an entertaining paid enforcer, is called Bazza or Bazzer either by his boss, or by those "two Northern monkeys", I can't remember which.
In the second movie, Layer Cake, I remember a guy, part of a Cockney English-speaking drug gang, being referred to as Gazza basically throughout the entire movie.
My first question is: Is this a standard rule for nicknaming amongst Cockney English speakers? My second question is: If it's a rule, from what personal name does Gazza come from? My final question, the one I care about most about, is: If it's a rule, can I get some examples on how this rule would be applied to other names?