The problem is when going back that far that although you can remember some early incidents you cannot remember which came first.
I can definitely put this one as under the age of 3 though, My parents, elder sister and myself were all sitting round the dinner table trying to think of names for my new brother or sister as my mother was expecting again....and I suggested all sorts of ridiculous names, most of which were not even names, eg rabbit and pergola boy or anything else that I could see.....and yes I knew what a pergola was then.