The original Queen Mary, built during the early 1930s, was meant to be named the Queen Victoria.
Since it was at the time to be the largest and fastest passenger ship in the world, Cunard wanted the wife of George V of England to christen it.
The wife of George V was Mary of Teck.
So, the chairman of Cunard telephoned the king, asking if his wife would be willing to smash the bottle.
He said yeah, sure, and by the way, what're you going to name it?
The chairman of Cunard said, "We're naming it after the greatest queen of England."
That's good, said George V; "the Queen Mary?"