Reactions are sparked by the incendiary book's title, which helps the Duke financially.
On Thursday, the title of the eagerly awaited tell-all memoir was revealed, and Sussex fans have praised the term as "iconic". While some have criticised the idea of using a "brutal" title.
In reference to Prince Harry and his elder brother Prince William, it has been suggested that the word "Spare" refers to the proverb "an heir and a spare."
"The impact of Prince Harry calling his memoir 'Spare' is truly legendary," journalist Stephanie Soteriou wrote on Twitter.
In response, a different user wrote: "The word "spare," which the media and the royal family have used to disparage Prince Harry his whole life, is in the title of his autobiography.
