Her Majesty's great-grandchildren Prince George and Princess Charlotte like to refer to the Queen as 'Gan-Gan,' while William jokingly called her 'Gary' when he was young after struggling with the pronunciation with 'Granny.'
High society gossip columnist Richard Kay in the Daily Mail, 'The Queen was on hand after William fell over at Buckingham Palace, bawling: ‘Gary, Gary’.
'A guest who went to help asked who Gary was, assuming it must be a member of the royal household. ‘I’m Gary,’ explained the Queen, as she scooped him up. ‘He hasn’t learned to say Granny yet'.’
Prince George and Princess Charlotte also apparently have a sweet nickname for Camilla.
The Duchess of Cornwall told Lady Gaga at the 2016 Royal Variety Performance that her grandkids call her 'Gaga'.
Prince Harry sweetly calls his father 'pa' and is often called 'darling boy' in return. This was demonstrated at the prince's wedding, when Prince Charles walked Meghan Markle down the aisle, Harry could be heard thanking his 'pa' and Charles sweetly replying.
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