Now that Prince William and Kate Middleton are married, some are wondering their last name.
Like other descendants of Queen Elizabeth II and Prince Philip, William's surname is Mountbatten-Windsor, and it will be Kate's too by marriage.
The royal website explains further that the surnames are not always used, only when they are formally needed, such as the case of marriage.
While Prince William will be recorded as a Mountbatten-Windsor in the marriage registry today, he may choose a new name at a later point, specifically if and when he becomes king. As explained here, "Since a royal proclamation is not binding on succeeding rulers, King William could decide to add a name or two."
Prince William and Kate, who will go by the name of Catherine, also gained the titles Duke and Duchess of Cambridge upon their marriage today, conferred upon them by Queen Elizabeth II.
CORRECTION: An earlier version of this post stated that the duke and duchess inherited their titles, which is not the case.
More royal unions!
Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge
Married at Buckingham Palace on April 29, 2011.
Archduke of Austria Christoph of Habsbourgh-Lorraine and Archduchess Adelaide Drape-Frisch
Married on December 29, 2012.
Prince Guillaume and Princess Stephanie of Luxembourg
Married at the Cathedral of our Lady of Luxembourg on October 20, 2012.
Phillippe de Riquet de Caraman and Francoise Bautier
The Prince of Chimay (L) married Bautier in Chimay on September 21, 2012.
Princess Carolina De Borbon and Albert Brenninkmeijer
Married in Florence, Italy on June 16, 2012.
Princess Ruth Komuntale of Uganda and Christopher Thomas
Shown here attending an introduction ceremony in the Gweri village in Uganda on November 15, 2012. Thomas is an American accountant.
Tupouto'a 'Ulukalala and Sinaitakala Tu'imatamoana 'i Fanakavakilangi Fakafanua
The Crown Prince of Tonga married his bride on July 12, 2012.
Melissa Countess Faber-Castell and Charles Alexander Count Faber-Castell
Married at Stein Castle on May 26, 2012.
Princess Felipa von Bayern and Christian Dienst
Married in Wieskirche on May 12, 2012.
Princess Hajah Hafizah Bolkiah and Pengiran Haji Muhammad Ruzaini
Brunei's royal couple married on September 23, 2012.
The former Olympic swimmer, who hails from South Africa, married Prince Albert II of Monaco on July 1, 2011 in a civil ceremony. There were rumors Charlene had cold feet before the wedding but the couple said "oui," got hitched and are presumably living happily ever after.
Princess Natalie of Sayn-Wittgenstein-Berleburg & Alexander Johannsmann
The German couple married on June 18, 2011. The bride had an "oops" moment when she forgot her bouquet and had to wait 15 minutes for an aide to fetch it before she got married.
Phillips is first cousin's with Prince William and Harry. She and Tindall, a pro rugby player, married on July 30, 2011 with a low-key ceremony attended by the British royal family.
Katie Percy and Patrick Valentine
Married at St. Michael's Church on February 26, 2011.
Coutess Helene d'Udekem d'Acoz and Baron Nicolas Janssen
Married at Eglise Saint Pierre on June 11, 2011.
The German couple married on August 27, 2011. Since there is no longer a German monarch and both are actually working consultants, the wedding was not as highly publicized... but they still got a red carpet and a horse and buggy.
Prince Nikolaos and Miss Tatiana Blatnik
The Prince of Greece and Denmark married Blatnik on August 25, 2010.
Princess Annemarie Gualtherie van Weezel and Prince Carlos de Bourbon de Parme
Married on November 20, 2010.
Princess Victoria of Sweden and Prince Daniel
Married on June 19, 2010 in Stockholm, Sweden.
Mark Dyer and Amanda Kline
The former Royal Equerry married Kline on July 3, 2010.
Prince Shivraj Singh of Jodhpur and Princess Gayatri Kumari of Askot
Married in Jaipur on November 19, 2010.
Lord Freddie Windsor and Sophie Winkleman
Married on September 12, 2009.
He is the King Bhutan and she was a commoner. The wedding, held on October 15, 2011, was Bhutan's largest media event in history. No foreign dignitaries were invited and the wedding was held in traditional style with the "blessings of the guardian deities."
Prince David Bagrationi-Mukhraneli and Princess Anna Bagrationi-Gruzinsky
Married in Tbilisi on February 8, 2009.
Archduchess Marie-Christine of Austria and Count Rodolphe of Limburg
Married on December 6, 2008.
Prince Joachin of Denmark and Marie Cavallier
Married on May 24, 2008.
Peter Phillips and Autumn Kelly
Grandson to Queen Elizabeth II and the only son of Princess Anne, Peter married Autumn on May 17, 2008.
Pengiran Khairul Khalil and Princess Majeedah Nuurul Bulqiah
Married at the Nurul Iman Palace in Bander Seri Bengawan on June 10, 2007.
Princess Alexandra of Denmark and Martin Jorgensen
Married on March 3, 2007.
Laura Parker Bowles and Harry Lopes
Laura, daughter of Camilla, Duchess of Cornwall, married Harry on May 6, 2006.
Prince Floris and Aimee Sohngen
Prince Floris, the youngest son of Princess Margriet of the Netherlands, married Aimee on October 22, 2005.
Prince Pieter Christiaan and Anita van Eijk
Married in the Netherlands on August 27, 2005.`
Prince Charles & Camilla, The Duchess Of Cornwall
Married on April 10, 2005.
Prince Felipe de Bourbon and Letizia Ortiz
This Spanish prince married Letizia on May 22, 2004.
Crown Prince Frederik & Mary Donaldson
This Danish prince married Aussie Mary Donaldson on May 14, 2004.
Barbara Cano and Bruno Gómez-Acebo
Bruno Gómez-Acebo of Spain married Barbara on October 5, 2002.
Princess Martha Louise Of Norway and Ari Behn
Married on May 24, 2002.
Crown Prince Haakon Of Norway & Mette-Marit
Married on August 25, 2001.
Prince Philippe Of Belgium and Miss Mathilde D'udekem D'acoz
Married on December 4, 1999.
Prince Edward and Sophie Rhys-Jones
Married on June 19, 1999.
Prince Joachim & Princess Alexandra Of Denmark
Married on November 18, 1995.
Lady Sarah Armstrong Jones and Daniel Chatto
Married on July 14, 1994.
Lord David Linley and Serena Stanhope
David Albert Charles Armstrong-Jones, Viscount Linley, married Serena on October 8, 1993.
Prince Abdllah and Rania Yassine
Married in Amman on June 10, 1993.
Lady Helen Windsor and Tim Taylor
Married on July 18, 1992.
Prince Andrew, the Duke of York, and Sarah Ferguson
Married on July 23, 1986.
Princess Astrid of Belgium and Archduke Lorenz
Married on September 22, 1984.
Prince Charles and Lady Diana Spencer
Married on July 29, 1981.
Princess Caroline of Monaco and Philippe Junot
Married on June 29, 1973.
Princess Beatrix of Holland and Prince Claus Von Amsberg
Married on March 11, 1966.
Princess Margaret and Antony Armstrong-Jones
Married on May 6, 1960.