The Prince of Wales, 71, will take to the throne when Her Majesty passes following his stint as the longest serving heir-apparent.
But although the British public may expect him to become King Charles III when that day comes, that may not be the case at all.
Royal rules state Charles – who was christened Charles Philip Arthur George – will be able to choose either of his first or middle names when he inherits his title.
And in 2005 it was speculated the Prince had actively discussed giving up the title of Charles III because of its unfortunate associations with previous monarchs named Charles.
Charles I was the only member of the monarchy to be tried and executed for treason, while his son Charles II – known for his legendary love life – ruled during the plague and Great Fire of London.
So now royal experts have told Daily Star Online they reckon Charles could go through with dropping his first name when he takes the throne.
One of them even thinks he will go with his third middle name George, and reign as George VII.
Former Buckingham Palace press spokesman Dickie Arbiter had also previously said that, by using the name George, Charles would be paying tribute to the both his grandparents.
He once told the BBC: “It would not just be a tribute to his grandfather (King George VI), but a sort of loving memory to his late grandmother, whom he absolutely adored.”
Talking to the Daily Star Online this week, royal commentator Richard Fitzwilliams said: “What name Charles will choose one day when he ascends the throne has long been a matter of speculation.
“The choice is up to him and there are precedents.
“Queen Victoria was christened Alexandrina Victoria but chose Victoria. Her son Edward VII was christened Albert Edward but out of respect for his father Prince Albert he chose Edward. George VI, the Queen's father was christened Albert Frederick Arthur George but used George.
“Given Prince Charles's high regard for his grandfather George VI and also his interest in his ancestor George III, as well as the controversy surrounding Charles I who was beheaded – as well as Charles being the name of the ‘Young Pretender’ Charles Edward Stewart – it is possible he might opt for George.
“On the other hand Charles II is synonymous with pleasure and revival so who knows! We may yet see King Charles III in real life as we have already in Mike Bartlett's play on stage!”
Brittani Barger, deputy editor of Royal Central, also told us: “I can see how negative connotations the name (Charles) carries could cause him to want to choose another name to reign under.
“If he were to choose another name to reign under, I think it would be George. It would be a nice gesture to his grandfather and a nice way to honour him.”
The University College London’s constitution department has also sought to clarify how Charles is free to choose his own name when he becomes King.
The constitutional experts said: “He (Charles) is free to choose his own regnal title.
“King Edward VII chose Edward as his regnal title, although hitherto he had been known by his first name of Albert.
“King Edward VIII also chose Edward as his regnal title, although he was known to his family and friends as David.
Prince Charles's Christian names are Charles Philip Arthur George. Instead of becoming King Charles he might choose to become King George VII, or King Philip, or King Arthur.”