There was also another discussion before the wedding regarding her title. In 2010, William reportedly asked Queen Elizabeth II not to make him a duke because he preferred Catherine to be known as “Princess Catherine.” But royal titles are tricky. If William had remained simply Prince William, his wife would technically have been styled as Princess William, not Princess Catherine. So Queen Elizabeth gave William the title Duke of Cambridge when they married in 2011, making Catherine the Duchess of Cambridge.
That changed after the death of Queen Elizabeth II in September 2022. Charles became king, William was upgraded to Prince of Wales, and Catherine became Princess of Wales, which is a title most closely associated with her predecessor, Princess Diana. The official royal website lists her as Catherine, Princess of Wales, and states that she married William at Westminster Abbey on April 29, 2011.
Ultimately, Catherine received the formal royal name many had long expected, without altering its spelling to accommodate any concerns over initials or monograms. Although the public may still often refer to her as Kate, and the palace uses the full name Catherine, the proposed change to “Katherine” never materialized.