NSW Australia

My NSW born Parents and their respective siblings have ALL been known by their "middle names" with one exception (see later).
You see, on my Dad's side, he was one of 17! All the boys first names were JOHN or ROBERT (in turn of course, their Grandfather's were John and Robert). All the girls first names were MARY or ELIZA (you guessed it, their Grannys names !)
Similar on my mother's side, and she was one of 11 !
The exception is my late Uncle .... John George Albert (3 given names) ...... he was known as "Gareth" from his earliest days .... and as "Uncle Gar" to my generation and Pop Gar to the younger set. When he married, his three given names were recorded on the church documents, and the civil registration has JGA too, BUT he signed "Gareth" ..... The Minister being his older bro

You will realise that JGA used his "usual signature" to sign those ledgers.
My cousins and I have a good laugh at what future family history searchers will make of that possible confusion.
Cheers, JM