Fact check: What are the full names and titles of Archie and Lilibet Mountbatten-Windsor?

1. What claimants said when names were first reported — the messy early record and main assertions that stuck

Early announcements and stories gave partial and sometimes inconsistent accounts: several contemporaneous articles identified Archie as Archie Harrison, while initial reports about Lilibet focused on the nickname “Lili” and cited the full name Lilibet Diana Mountbatten-Windsor in later reports. The dataset shows one source explicitly stating Archie Harrison Mountbatten-Windsor ^[1], while other early pieces mentioned only “Prince Archie” without a full name ^{[5] [2]}. For Lilibet, multiple later write-ups provide Lilibet Diana Mountbatten-Windsor and the diminutive “Lili” as used by family and press ^{[3] [4]}. Discrepancies reflect staggered disclosures and varying editorial detail.

2. How Archie’s name is presented across the supplied reporting — consistency and gaps

Across the supplied materials, Archie is consistently identified with the given name Archie and the middle name Harrison in specific pieces, but some articles simply call him “Prince Archie” or “Archie Harrison” without the full surname. The explicit full-form Archie Harrison Mountbatten-Windsor appears in at least one source that asserts the trio of given, middle and surname together ^[1]. Other contemporaneous pieces omit the surname or omit the middle name, indicating varying editorial choices rather than documented contradiction about the core given name and middle name ^{[5] [2]}.

3. How Lilibet’s name is presented across the supplied reporting — emergence and confirmation

Reporting in the provided set offers clearer, repeated identification for Harry and Meghan’s daughter as Lilibet Diana Mountbatten-Windsor and notes the familial nickname “Lili.” Multiple items present Lilibet’s full name and tie it to both her parents and the royal family naming traditions, emphasizing Diana as a middle name honoring the late Princess of Wales ^{[3] [4]}. Some earlier or brief items referenced only “Princess Lilibet” or “Lilibet ‘Lili’” without the full triple-name; later or more detailed pieces supply the full legal form ^[5].

4. Titles and styles: how the media and official phrasing differ

The supplied sources show a mix of courtesy titles used in media coverage — “Prince Archie” and “Princess Lilibet” — alongside full-name usage ending in Mountbatten-Windsor. Some pieces consistently use the style with title and first name for public readability, while others opt for the legal-surname construction when listing full names ^[5]. This dual usage reflects both royal protocol practices and editorial preference: titles are common in announcements and social references, whereas full names including Mountbatten-Windsor appear in formal contexts or detailed profiles ^{[1] [4]}.

5. Timeline and sourcing: which sources reported what and when

The provided sources cluster around September 10–12, 2025, with earliest items often offering briefer summaries and later pieces supplying fuller name detail. For Archie, a September 10 item contains the explicit full-name claim ^[1], while other same-date pieces provided partial naming ^{[5] [2]}. For Lilibet, September 11–12 pieces confirm Lilibet Diana Mountbatten-Windsor and the “Lili” nickname ^{[3] [4]}. The progression suggests initial rapid reporting followed by confirmation and elaboration as more information became available.

6. What’s omitted, and why those omissions matter for full identification

Several early or shorter reports omit either the middle name or the surname, and one cluster of items fails to mention Lilibet’s full name at all while focusing on attendance or family events ^{[5] [2]}. These omissions matter because public understanding of legal names versus courtesy styles depends on explicit reporting; absent that, readers may conflate title usage with legal surname. The supplied sources demonstrate that full legal names were later documented ^{[1] [3] [4]}, but not all coverage immediately presented that full detail.

7. Bottom line — concise answer grounded in these sources

Based on the provided reporting, the full names are Archie Harrison Mountbatten-Windsor and Lilibet Diana Mountbatten-Windsor, and both children are commonly referred to with the courtesy styles Prince Archie and Princess Lilibet in media coverage. The evidence shows incremental disclosure across September 10–12, 2025, with some early articles omitting full surnames while later pieces confirm the full names and the use of Mountbatten-Windsor ^{[1] [2] [3] [4]}.