As per royal tradition, Prince Harry and Meghan Markle were given their titles by Queen Elizabeth II on theday of their marriage in 2018 - but one is rarely used by the couple. The Duke of Sussex's official titles are The Duke of Sussex, Earl of Dumbarton and Baron Kilkeel.

Whereas, the Duchess’s official titles are The Duchess of Sussex, Countess of Dumbarton and Baroness Kilkeel. The Earl and Countess of Dumbarton are titles Harry and Meghan are not keen on using, and they also refused the title for Prince Archie, according to a well-placed source.

The Telegraph reports a source said: "They didn’t like the idea of Archie being called the Earl of Dumbarton because it began with the word ‘dumb’ [and] they were worried about how that might look."

Before Harry, the title the Duke of Sussex was last used 175 years ago by Prince Augustus Frederick – a son of King George III, as stated in the Telegraph.

As per tradition, he has been given one title from England, one from Scotland and one from Northern Ireland on his marriage.

The Earldom has been given on one previous occasion to George Douglas, a younger son of the first Marquess of Douglas, who was created Earl of Dumbarton in 1675.

Dumbarton is a town on the north bank of the river Clyde in the west of Scotland. The title of Baron Kilkeel has never previously been granted, prior to Harry. Kilkeel is a small fishing town on the coast of County Down in Northern Ireland.