People often wonder if senior members of the British royal family actually have last names. The short answer is yes, but they rarely use them. Prince William and Prince Harry belong to the House of Windsor, but their personal family surname is Mountbatten-Windsor. Because of ancient royal customs, letters patent, and peerage titles, sorting out what the brothers are called on legal documents requires looking closely at 20th-century decrees and modern title updates.
Understanding how royal surnames work cuts through internet rumors and clarifies how law, legacy, and loyalty intersect in the British monarchy. While ordinary citizens use surnames daily, senior royals function differently under British constitutional law.
The Origins of Windsor and Mountbatten-Windsor
Before 1917, the British royal family didn't use a formal surname. They went by the names of their ruling houses—such as Tudor or Stuart—which shifted whenever a new dynasty inherited the throne. That changed during the First World War. Anti-German sentiment running high across Britain prompted King George V to drop the family's historic German dynastic name, Saxe-Coburg and Gotha.
In 1917, King George V issued a royal proclamation declaring that all descendants of Queen Victoria in the male line, except women who married, would bear the name Windsor. The royal house became the House of Windsor, fixing a permanent English identity to the dynasty.
Decades later, Queen Elizabeth II wanted to carve out a specific legacy for her own direct descendants with Prince Philip. Philip came from the Greek and Danish royal houses and had adopted the surname Mountbatten after naturalizing as a British subject. In February 1960, the Queen issued a Privy Council declaration stating that her descendants—excluding those with the style of Royal Highness and the title of Prince or Princess—would carry the hyphenated surname Mountbatten-Windsor.
How Titles Replace Surnames for William and Harry
For most of their lives, Prince William and Prince Harry didn't use a standard last name. Under historic letters patent issued by King George V in 1917, children of the sovereign and grandchildren of the sovereign in the male line automatically receive the titles of Prince and Princess alongside the style of Royal Highness.
Because William and Harry were grandchildren of Queen Elizabeth II through the male line, they grew up as princes. In official everyday life, peers and senior royals use their territorial titles instead of a surname.
- During their school years and military service, William and Harry used Wales as a surname. This practice stemmed from their father's title at the time, the Prince of Wales.
- William's military colleagues and superiors called him Lieutenant Wales, while Harry served as Captain Wales.
- When William married Catherine Middleton in 2011, he became the Duke of Cambridge, and his children—George, Charlotte, and Louis—initially used Cambridge as a school surname. Now that William is the Prince of Wales, his children use Wales.
When a royal holds the style of Royal Highness and a princely title, the law views a surname as legally redundant. However, exceptions occur when dealing with civil courts outside the UK. For instance, Prince William used Mountbatten-Windsor during legal proceedings in France, proving that the surname exists for legal necessity rather than daily use.
Prince Harry, Meghan Markle, and Archie's Surname Choice
When Prince Harry married Meghan Markle in 2018, Queen Elizabeth II bestowed upon them the titles of Duke and Duchess of Sussex. Under the 1960 Privy Council order, their children were technically entitled to bear the Mountbatten-Windsor surname because great-grandchildren of the monarch do not automatically receive the style of Royal Highness unless targeted by new letters patent. (Though King George V's 1917 rules only protected the eldest son of the eldest son of the Prince of Wales, Queen Elizabeth II issued new letters patent in 2012 to ensure all of William's children became princes and princesses).
When Prince Harry and Meghan welcomed their son Archie in 2019, they chose not to use Harry's subsidiary peerage title (Earl of Dumbarton) as a courtesy title. Instead, they registered him with the surname Mountbatten-Windsor.
This decision made Archie the first direct descendant of Queen Elizabeth II and Prince Philip to publicly use the hyphenated surname from birth. When his sister, Lilibet, was born, she also used Mountbatten-Windsor. Following the accession of King Charles III in September 2026, Archie and Lilibet gained the formal status of prince and princess as grandchildren of the reigning monarch, though their parents continue to use Mountbatten-Windsor as their family surname in private life.
Legal Precedents and Modern Royal Changes
The interplay between royal law and surnames shows how adaptable the British monarchy remains. Surnames protect legal identity when titles cannot be used, but tradition keeps titles at the forefront.
Legal experts often point out that royal surnames sit in a grey area between constitutional law and personal choice. The Official Royal Family Website clarifies that while the House name remains Windsor, the personal surname rule gives lower-ranking members a clear legal identity if they step away from working royal duties.
When members step back from official duties—as Prince Harry did in 2020—the underlying legal surname guarantees they can sign contracts, open bank accounts, and register births without relying on active Crown titles. Legacy and law merge here: the title satisfies public loyalty, while the surname satisfies civil reality.
Frequently Asked Questions
Do Prince William and Prince Harry have passports?
No. British passports are issued in the name of the Crown. Since the passport belongs to the monarch, the reigning king or queen does not need one. However, other members of the royal family, including William and Harry, hold official passports for international travel, which typically list their names and titles according to government documentation.
Can members of the royal family legally change their last name?
Yes. As British citizens, they possess the legal right to execute a deed poll, though doing so would conflict with centuries of constitutional tradition and letters patent issued by the sovereign. Their family names are regulated by the reigning monarch via the Privy Council, meaning sweeping changes require royal consent.
Why do some royals use their mother's maiden name or territorial designations?
Historically, royals use territorial designations (like Windsor or Wales) to fit social settings where titles draw unnecessary attention, such as school or military barracks. Using a territorial designation links them directly to their father's or monarch's principal Dukedom or principality.
Are Archie and Lilibet considered Mountbatten-Windsors?
Yes. While they became entitled to royal prince and princess titles when their grandfather Charles became king, their birth certificates and family identity remain anchored by the surname Mountbatten-Windsor. Harry and Meghan chose this surname to give their children a grounded, private-citizen framework during their early years.
