Prince Harry and Meghan Markle are now officially the Duke and Duchess of Sussex.

Unlike us commoners, they don't go by a surname and, therefore, Ms Markle is no more.

It is a generally acceptable fact that the Royal family does not go by any surname. Some people don't need a surname (Beyonce, a whole different kind of royalty, doesn't really need hers either). But why has the Royal family decide to ditch theirs?

Royals had no surnames before 1917 at all. They had their first name and the name of the house or dynasty they were part of (such as House of Tudor or House of York, to name a couple).

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The Duke and Duchess of Sussex need no surname... but they can use one if they want to. Photo / Getty Images
The Duke and Duchess of Sussex need no surname... but they can use one if they want to. Photo / Getty Images

In 1917, King George V decided to change the name of the house from Saxe-Coburg-Gotha to Windsor.

This change happened because of the anti-Germany sentiments that were around at the start of World War I. He chose Windsor because of Windsor Castle, one of the family's properties.

He also decided that Windsor was to become not just the name of the dynasty but the royal family's surname as well.

Things stayed that way until Queen Elizabeth II came to power.

After marrying Philip Mountbatten, the couple decided they wanted to differentiate their own branch of the family tree and so the hyphenated surname Mountbatten-Windsor was born.

Prince Harry & Meghan say their vows. / AP

The rules state that royals with titles like "His Royal Highness Prince" or "His Royal Highness Princess" do not need to use a surname but they can use it if they want to.

In fact, they can even change back to older rules if they want. For example, when Prince William and Prince Harry served in the military, they went by William Wales and Harry Wales, something they could do because their father, Prince Charles, is Prince of Wales.

Other royals have veered off the rules a bit too. Princess Anne's children, for example, took their father's surname: Phillips.

The reality is that the surname is there but no one is really forced to use it. While, technically, their surname is still Windsor, the Queen's direct descendants can use Mountbatten-Windsor if they want or need, but most of them choose not to bother with surnames at all.

Royal Wedding: Prince harry tears up as Meghan Markle joins him at the altar. / AP