The British Royals Message Board: Re: British Royals surname

Regarding the full formal names of children/descendants within a royal ducal style, the easy way to understand is that the son/daughter of the duke will always formally include "of York/Sussex/Kent/Gloucester" or other existing ducal style. The media frequently drops it, but it's there in a court circular or other formal media release. Regarding Sussex, it should be something like "Princess Lilibet of Sussex" just like Prince Andrew Duke of York's daughters are "Princess Eugenie/Beatrice" of York. The legal surname of all descendants of QEII is "Windsor-Mountbatten", the other extended andcollateral family (Kent, Gloucester) remain just "Windsor" in their surname. The house name changed in the Fifties to reflect the marriage of QEII to a Mountbatten.

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The BRF have the strangest way of naming themselves.
Instead of using the family name, they use theit titles as surname.

K.Charles was born Pr.Charles of Edinburgh during G VI's reign, before becoming Charles Prince of Wales and finally King Charles III of the UK.

William and Harry were styled "of Wales" as sons of the then PoW.

While William's children were styled "of Cambridge" , Harry's children have the Windsor-Mountbatten surname.

Have George, Charlotte and Louis changed their surname to "of Wales" as the children of the current PoW after Charles accession to the throne ?

What about Harry ? He is no longer the son of a PoW. Does he remain a "of Wales" ?
Not sure if William would appreciate having to share the surname (again) with Harry.
What surname appears in his passport, driving licence, american official documents ?