Queen Elizabeth
The royals don't use the Queen's first name "Elizabeth" because they prefer her nickname "Lilibet." Pictured: Queen Elizabeth is seen at the Chichester Theatre while visiting West Sussex on Nov. 30, 2017 in United Kingdom. Getty Images/Stuart C. Wilson

Queen Elizabeth is never addressed by her family using her first name.

When Queen Elizabeth was still a child, she was unable to pronounce her full name and subsequently called herself "Lilibet." The name stuck and was adopted by her parents and grandparents. Since then, the Queen was never addressed by her name, but by her moniker "Lilibet."

King Goerge VI once said that Lilibet is his pride, while Princess Margaret is his joy. The Queen also used this name when she signs off her letter to her grandmother, Queen Mary.

"Darling Granny. Thank you very much for the lovely doll's house. I do love it, and I have unpacked the dining room and the hall. Love from Lilibet xxx," the monarch rote.

Meanwhile, Prince Philip calls Her Majesty "Cabbage." There are speculations that this comes from the French words "mon petit chou," which literally translates to "my little cream puff," meaning "my sweety." However, its English translation is "my little cabbage."

On the other hand, Prince William and Prince William have their own endearments for their grandmother. The Duke of Cambridge and Duke of Sussex call the Queen "granny." The pair was heard calling the monarch this way when they cheered for her during the 2012 Olympic Games opening ceremony, where she made an appearance alongside "James Bond" star Daniel Craig.

In related news, Queen Elizabeth II is the first British monarch to visit Russia, China and Japan. It took longer for the family to make a state visit to these countries due to political issues in the past.

The Queen's visit to the Land of the Rising Sun wasn't smooth. In fact, she and Prince Philip were due to travel onboard the high-speed Shinkansen train, but they didn't push it because of the rail strikes.

The monarch didn't visit the country again, but returned the favor by inviting the Emperor of Japan to Buckingham Palace. During their dinner, she spoke about the animosity between the two countries in the past. She encouraged everyone that "it is precisely the reason which should make us all the more determined never to let it happen again."

Queen Elizabeth II is currently at Balmoral for the summer. Prince William and Kate Middleton are expected to fly in Scotland to join her at this time of the year.