Prince Harry and Prince William share the last name Mountbatten-Windsor, which is the official surname used by some descendants of Queen Elizabeth II when a surname is required.
While commonly known as Mountbatten-Windsor, individuals with royal styles may use different surnames in military service, marriage, or private contexts. This article explains the origins of Mountbatten-Windsor, how royal surname conventions work, notable uses by Harry and William, and related family naming practices.
What surname do Harry and William officially share
Official surname: Mountbatten-Windsor
Mountbatten-Windsor is the surname shared by certain members of the royal family, originating from the 1960 directive that combined Prince Philip’s Mountbatten with the House of Windsor. It is used when a surname is necessary for individuals who do not have a territorial designation from a title. Both Prince William and Prince Harry carry this surname officially, though it is seldom used in day-to-day royal duties.
When and why the name is used
Members of the royal family may use Mountbatten-Windsor on formal documents, for military service, or in civil situations where a surname is required. For example, Prince William was known to use the surname Wales during his time in the military, while Prince Harry used his father’s title–derived surname in certain service contexts. The use of Mountbatten-Windsor is one element of how royal conventions balance tradition with practical administrative needs.
Royal surname conventions and style rules
Why surnames are not always needed
Within the royal family, individuals are often known by their first name or their title, and a surname may not be used in everyday life. When required, the royal household applies a combination of historic names, military affiliations, or family designations. These conventions help distinguish roles, service branches, and personal identity while maintaining a unified family legacy.
Surname choices for working royals
Working royals sometimes adopt surnames tied to their education, military unit, or title. For instance, Prince William used Wales as his surname while training at military academies, reflecting his father’s title. Prince Harry similarly selected surnames related to his service. In more formal or legal contexts, Mountbatten-Windsor serves as the default shared name.
Practical examples and family naming patterns
Service and surname usage
- Prince William: Used the surname Wales during military training and service; officially listed as Mountbatten-Windsor when required.
- Prince Harry: Used Wales early in training and Mountbatten-Windsor in other official contexts, including certain military documentation.
- Other descendants: Some younger royals and extended family members use varied surnames based on marriage, personal preference, or professional needs.
Comparison of common royal surnames
| Name or Title | Typical Surname Use | Context |
|---|---|---|
| Mountbatten-Windsor | Official shared surname | Formal, legal, or military documents when a surname is required |
| Wales | Service surname for William and Harry early in training | Military academy and service contexts |
| Cambridge | Title-based surname for William as Prince of Wales | Military and some official uses |
| Surrey | Territorial surname for younger royals | Private or non-service contexts |
Origins of Mountbatten-Windsor
Historical formation of the surname
Mountbatten-Windsor emerged from a 1960 declaration by the royal household, combining Prince Philip’s family name Mountbatten with the established royal house name Windsor. This was intended to provide a surname for descendants who were not styled as Royal Highnesses or who did not carry a territorial title. The name reflects both family lineage and institutional continuity.
Evolution and official recognition
Over time, Mountbatten-Windsor has been recognized in legal, military, and administrative contexts as the default surname for certain royal family members. Its use is governed by royal protocol and practical needs, ensuring clarity in documentation while respecting the broader variety of surnames adopted by individual members.
Common questions about the royal surname
Do Harry and William use the same surname publicly?
In public-facing royal duties, neither typically uses Mountbatten-Windsor as part of their title. Instead, they are known by their honorary titles and geographic designations. In private or administrative settings where a surname is required, Mountbatten-Windsor may be used.
Can the surname change in the future?
Surname conventions can evolve with new royal generations, marriages, and institutional decisions. Any future changes to the use of Mountbatten-Windsor would be determined by the royal household in consultation with relevant authorities. The current practice balances heritage, practicality, and clarity.
Is Mountbatten-Windsor used by all descendants?
Not all descendants use Mountbatten-Windsor; some may adopt marital surnames, territorial titles, or professional names depending on their roles and circumstances. The name remains the default for certain official purposes when no other surname is specified.