Dickie Arthur, author of On Duty with the Queen, said in an interview with Hello! that Charles could choose another of his middle names as his official title when he becomes King.
'He might choose one of his other names Philip, Arthur or George,' Arbiter said.
Charles wouldn't be the first monarch to change his name once he takes the throne.
His own grandfather's name was Albert, but he chose to titled King George VI.
Along with the title the King of England, Charles will also inherit many other titles - including the Duke of Lancaster, Defender of the Faith, Supreme Governor of the Church of England, Head of the Commonwealth, and King of other Realms and Territories.
'[Charles will] also be Lord of the Man (Isle of Man) and Duke of Normandy,' Arbiter said.
'But generally he’ll only be known as king.'
The royal author also added that he believes Camilla will become Queen Consort when her husband ascends the throne.
However, her title has become somewhat of a controversy of late.
Earlier this year, Clarence House removed any mention of Camilla’s possible title from its website, while it was also removed from her personal biography and Buckingham Palace’s website.
'This is one question that Clarence House has not been asked by the public for some time, which is why it no longer features,' a spokesman said at the time.
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