Prince William and Duchess Kate’s third child, who was born on Monday, already boasts a very long, fancy title: His Royal Highness Prince Louis Arthur Charles of Cambridge.

Prince Louis won’t have is a last name, at least not officially. When the children of the Queen and Prince Philip need to use a surname, they use Mountbatten-Windsor. That last name first appeared on an official document in 1973, when Princess Anne got married. And that will be the case unless Prince Charles decides differently when he becomes king. Prince William and Duchess Kate often use the surname Cambridge for their family, and Prince Harry has often used Wales as his surname.

Here are the full names and full titles of key members of the royal family, though those titles can change depending on where they are in the world at the time.

Full name: Elizabeth Alexandra Mary

Full title: Elizabeth II, by the Grace of God, of the United Kingdom of Great Britain and Northern Ireland and of her other realms and territories Queen, Head of the Commonwealth, Defender of the Faith

Full name: Born Philip, Prince of Greece; he has also been known as Philip Mountbatten

Full title: His Royal Highness Prince Philip, Duke of Edinburgh, Earl of Merioneth and Baron Greenwich, Knight of the Garter, Knight of the Thistle, Order of Merit, Knight Grand Cross of the Order of the British Empire, Companion of the Order of Australia, Companion of The Queen's Service Order, Privy Counsellor

Full name: Charles Philip Arthur George

Full title: His Royal Highness Prince Charles Philip Arthur George, Prince of Wales, KG, KT, GCB, OM, AK, QSO, CC, PC, ADC, Earl of Chester, Duke of Cornwall, Duke of Rothesay, Earl of Carrick, Baron of Renfrew, Lord of the Isles and Prince and Great Steward of Scotland

Full name: Born Camilla Rosemary Shand; after her first marriage, was known as Camilla Parker Bowles

Full title: Her Royal Highness The Duchess of Cornwall

Full name: William Arthur Philip Louis

Full title: His Royal Highness Prince William Arthur Philip Louis, Duke of Cambridge, Earl of Strathearn, Baron Carrickfergus, Royal Knight Companion of the Most Noble Order of the Garter

Full name: Born Catherine Elizabeth Middleton

Full title: Her Royal Highness The Duchess of Cambridge

Full name: George Alexander Louis

Full title: His Royal Highness Prince George of Cambridge

Full name: Charlotte Elizabeth Diana

Full title: Her Royal Highness Princess Charlotte of Cambridge

Full name: Louis Arthur Charles

Full title: His Royal Highness Prince Louis Arthur Charles of Cambridge

Full name: Henry Charles Albert David

Full title: His Royal Highness Prince Henry of Wales

Full name: Rachel Meghan Markle

Full title: To be determined

Full name: Andrew Albert Christian Edward

Full title: His Royal Highness The Prince Andrew Albert Christian Edward, Duke of York, Earl of Inverness, Baron Killyleagh, Knight Companion of the Most Noble Order of the Garter, Knight Grand Cross of the Royal Victorian Order, Canadian Forces Decoration, Aide-de-Camp to Her Majesty.

Full name: Beatrice Elizabeth Mary

Full title: Her Royal Highness Princess Beatrice Elizabeth Mary of York.

Full name: Eugenie Victoria Helena

Full title: Her Royal Highness Princess Eugenie of York

Full name: Anne Elizabeth Alice Louise

Full title: Her Royal Highness The Princess Royal

Full name: Zara Anne Elizabeth

Full title: No title.

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