My ggg grandfather was John Rourke b 1828 Ireland, married Mary Toole in Sydney 1857. I was just looking at your posting on the board and I couldn't help but see the similarities in the childrens names.
1 male deceased.
These details were taken from Thomas James' birth certificate, so it is possible that more children came from this marriage.
All of these children above, were known as O'Rourke.
I don't think there is any connection, but I just saw the similarities in the names and thought it odd.