Prince William's full name is William Arthur Philip Louis. This verified profile explains how each name element fits into his royal style and title. Born 21 June 1982, he is the elder son of Charles III and the late Diana, Princess of Wales, and second in line to the throne. The explainer covers the meaning of his three given names, the use of Arthur and Louis as personal names, and how his formal style has evolved with key dates such as his 2011 marriage and 2022 inheritance of his father's titles. The following sections clarify these details for long-term reference.
Full Name and Given Names
William Arthur Philip Louis is recorded as his birth name, with Arthur, Philip, and Louis serving as personal or middle names. In royal practice, Arthur has been used within the family for generations, while Philip honors his paternal uncle and Louis continues a multi-generational tradition. Together, these names form his complete given name, though in everyday use he is known simply as Prince William or, more formally, His Royal Highness Prince William, Duke of Cambridge. The structured use of multiple given names is common among senior working royals and reflects both family history and public identity.
Arthur: Family Legacy
The name Arthur carries deep family significance and has been used by multiple British royals over centuries, including a recent Prince Arthur within the contemporary family. For William, Arthur is a traditional middle name that links him to this legacy. Its use helps maintain continuity in the naming patterns of the House of Windsor and signals lineage when referenced in official or historical records.
Philip: Honoring a Patriarch
Philip is the name of his late paternal uncle, Philip, Duke of Edinburgh, and is included to honor that legacy. The consistent recurrence of Philip in the family tree reinforces continuity and respect for senior royal figures. This practice of honoring forebears through names is well established in royal protocol and genealogical record-keeping.
Louis: Multi-Generational Use
Louis follows a long royal lineage, appearing in multiple generations of the family tree, including close relatives of his parents. Its retention as a middle name demonstrates adherence to established naming customs that blend personal tribute with institutional tradition. The selection of these names is typically coordinated privately within the family and confirmed through official announcements at key life events.
Style, Title, and Formal Address
From birth, William held the courtesy style of Prince William of Wales, reflecting his position as a male-line grandchild of the sovereign. Key dates have shaped his current formal style. On 29 April 2011, on the day of his marriage, he was created Duke of Cambridge, Earl of Strathearn, and Baron Carrickfergus, introducing territorial designations that remain central to his public role. On 8 September 2022, following the death of Queen Elizabeth II and the accession of his father, he became the Prince of Wales and Earl of Chester, and in November 2022 he was made Duke of Cornwall. These titles are listed with their associated dates and significance in the summary table below.
| Attribute | Verified Detail | Source Type |
|---|---|---|
| Full Birth Name | William Arthur Philip Louis | Official birth record |
| Date of Birth | 21 June 1982 | Official announcement |
| Primary Title (as of 2025) | His Royal Highness The Prince of Wales, Duke of Cornwall, Duke of Cambridge | Court circulars |
| Key Style Changes | 29 May 2006: Prince William; 29 April 2011: Duke of Cambridge; 8 Sept 2022: Prince of Wales | Court announcements |
| Heir Status | First in line to the throne since 8 Sept 2022 | Succession law and court statements |
Common Usage and Public References
In public and media contexts, he is consistently referred to as Prince William, with the secondary title Duke of Cambridge frequently used to distinguish his work in areas such as mental health, emergency services, and conservation. The use of Arthur or Philip in formal royal signatures is rare in public communication, while Louis appears more commonly in ceremonial contexts. Understanding these naming conventions helps clarify why certain titles are used in different situations and how his identity balances private family tradition with public duty.
Royal Naming Customs
Royal naming conventions often involve selecting multiple given names for private use while adopting a single, recognizable name for public life. This approach offers flexibility between personal heritage and public simplicity. By including names such as Arthur, Philip, and Louis, the family preserves historical continuity, while the public-facing title remains concise and identifiable. These customs are documented in court circulars and biographies and can influence the public perception of royal roles over time.
Notable Life Dates and Events
Several key dates define the evolution of William's titles and public responsibilities. His birth on 21 June 1982 established his place in the line of succession. The creation as Duke of Cambridge on 29 April 2011 formalized a new stage tied to his marriage and early public role. In 2022, the simultaneous changes in September and November moved him into direct line for the highest royal titles, reflecting the transition of duties within the family. These milestones are anchored in official records and continue to shape how his role is understood and reported.
Summary
Prince William's full name is William Arthur Philip Louis. Each component reflects family tradition, personal tribute, and continuity within the royal framework. His titles, including Prince of Wales and Duke of Cambridge, have been shaped by key dates such as 2011 and 2022, and are supported by official documentation. This overview provides a clear, fact-focused foundation for understanding his name, style, and evolving role. The information remains relevant for reference, research, and long-term public understanding of the monarchy's structure.