Prince William reacted with anger when his father, then Prince Charles, and Queen Camilla suggested that Kate Middleton change the spelling of her name from Catherine to Katherine, according to author Christopher Andersen's biography "Kate! The Courage, Grace, and Power of the Woman Who Will Be Queen."

The request was reportedly made to avoid a potential overlap with the interlocking "C" monograms of Charles and Camilla. Andersen writes that William considered the suggestion "insulting" not only to his wife but also to her family, stating that he defended Kate on her behalf.

Andersen told Fox News Digital that the concern over a third royal cypher with a "C" highlights the importance of image and branding within the royal family, describing the monarchy as a "giant game of one-upmanship." He added that William has consistently defended Kate, citing his strong reaction to the publication of topless photos of her in 2012 and his efforts to ensure she did not have an overwhelming workload after they started a family.

According to the book, Charles and Camilla expected Middleton to comply, but she personally preferred her given name and felt strongly about the name her parents chose. While known to the public by her nickname, Kate, her formal name is Catherine.

Despite the alleged request, Middleton reportedly did not hold ill will toward Charles, viewing the idea as "absurd" and possibly originating from someone else. The book notes that the situation was eventually overshadowed by simultaneous cancer diagnoses within the family.

Andersen described Middleton as having a "will of steel" beneath her kind and compassionate demeanor, suggesting that altering her formal name for such a reason was "a bridge too far" for her.

British broadcaster Helena Chard described the issue as a "nonstarter," suggesting that Charles and Camilla were approaching the situation from a "business head" since Middleton was already widely known as Kate. She noted that while the concern was valid from their perspective, it was ultimately brushed aside.

Royal broadcaster Ian Pelham Turner speculated that the incident could have been a "volatile moment" but emphasized William's protective role. He also observed that Middleton has since built a stronger individual brand as William takes on more responsibilities.

Royal expert Richard Fitzwilliams called the alleged incident "idiotic" and "stupid," questioning the reasoning behind the name change suggestion based on the initial letter of their names.

Andersen concluded that the episode underscores the royal family's meticulous attention to detail regarding their public image, extending to elements as small as letters on their crests, which hold significant meaning for them despite seeming trivial to outsiders.