Prince George has a surname choice for school

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He's known to the world as 'Prince George' but the young royal will have to adopt an official surname when he starts school in September - and royal pundits are debating which one he'll opt for.

The third-in-line to the throne, who celebrated his fourth birthday yesterday, will need a surname for the school register and there's two possible monikers: Cambridge or Mountbatten-Windsor.

Technically, because his great-grandmother is the Queen, he has the title of 'His Royal Highness' so he doesn't actually need a surname at all.