Britain’s newborn prince has been named Louis Arthur Charles, the royal household announced Friday.
In a tweet that was posted on Kensington Palace’s official account, the household added: “The baby will be known as His Royal Highness Prince Louis of Cambridge.”
The Duke and Duchess of Cambridge’s third child was born at St. Mary’s Hospital in London on Monday, weighing 8 pounds, 7 ounces.
The couple already have a boy, Prince George, born in 2013, and a girl, Princess Charlotte, born in 2015.
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The announcement follows days of speculation on the choice of name.
Prince William, who is second in line to the throne, has four names — William Arthur Philip Louis.
The new prince is fifth in line to the throne, and Queen Elizabeth II’s sixth great-grandchild.
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The family now lives in London’s Kensington Palace, where William and his brother Prince Harry grew up, after residing for several years at their country home in Norfolk, Anmer Hall.