The development is thought to represent a major blow to the Sussexes, who now face starting again and re-registering everything from their website to their charity under a new label.
Harry and Meghan first began using the Sussex Royal branding this time last year, after they split their household from that of the Duke and Duchess of Cambridge – known as Kensington Royal.
The Sussexes' Instagram page, @sussexroyal, has amassed 11.2million followers – the same number of fans as William and Kate's account.
It was a natural progression, therefore, for Harry and Meghan to use the moniker for their new charitable foundation, due to be launched this year with the support of Buckingham Palace.
