In a statement, Kensington Palace said:
The Duke and Duchess of Cambridge are delighted to announce that they have named their son George Alexander Louis.
The baby will be known as His Royal Highness Prince George of Cambridge.
The latest addition to the royal family has been named Prince George Alexander Louis, but where did the Prince get his names?
The Duke and Duchess of Cambridge have named their son George Alexander Louis, Kensington Palace said.