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One surprise in William and Kate's name choice was the absence of the name Philip, which would have been a tribute to Louis's great-grandfather. The couple may be leaving the option of using the name to Prince Harry, who will wed Meghan Markle on May 19.

Prince Louis, who was born at 11:01 a.m. local time on April 23, is now fifth in line to the throne behind Prince Charles, Prince William, Prince George and Princess Charlotte.

\"PHOTO:
David Fisher/REX/Shutterstock
PHOTO: Prince William and Catherine Duchess of Cambridge leave the hospital with their newborn baby boy at the Lindo Wing, St Mary's Hospital, London, April 23, 2018.
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Kate departed St. Mary’s Hospital for Kensington Palace just hours after giving birth, posing upon her departure with William and their son.

\"PHOTO:
Tim Rooke/REX via Shutterstock
PHOTO: Prince William and Catherine Duchess of Cambridge leave the hospital with their newborn baby boy at the Lindo Wing, St Mary's Hospital, London, April 23, 2018.
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St. Mary’s Hospital is where Kate also gave birth to her older children, George, 4, and Charlotte, who turns 3 on May 2.

\"PHOTO:
David Fisher/REX via Shutterstock
PHOTO: Prince William returns to the Lindo Wing with Prince George and Princess Charlotte as they enter to meet their brother for the first time at St Mary's Hospital in London, April 23, 2018.
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William and Kate revealed George’s name -- George Alexander Louis -- two days after his July 22, 2013, birth.

Royal children usually get three names and are often named after former monarchs. George was named after Queen Elizabeth’s beloved father, King George, who died when she was just 26-years-old.

Charlotte’s name -- Charlotte Elizabeth Diana – was announced two days after her May 2, 2015, birth.

When Charlotte was named, the couple selected family names. Charlotte is the middle name of Kate's sister, Pippa Middleton, and the feminine version of Charles. Charlotte's middle names, Elizabeth Diana, honor her great-grandmother, Queen Elizabeth, and grandmother, the late Princess Diana of Wales.

\"Princess
Ben Stansll/AFP/Getty Images
Princess Charlotte of Cambridge, Prince George of Cambridge by their father Britain's Prince William, Duke of Cambridge, at the Lindo Wing of St Mary's Hospital in London, April 23, 2018, to visit Catherine, Duchess of Cambridge, and their new-born son.
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For their third child, William and Kate may have decided to wait for a few days to announce his name until they had a chance to introduce the baby prince to Prince Charles and Queen Elizabeth.

Queen Elizabeth has been in Windsor, away from Buckingham Palace, and Prince Charles has been out of the country on royal engagements.

It is also possible that William and Kate were just struggling with what to name their new baby and whom they would like to honor. William had expressed his desire that the baby have a “strong name.\"

When William was born on June 21, 1982, his parents didn't reveal his name until one week later. Prince Charles was a month old before his name was made public.

William's brother, Prince Harry, has been an exception. His name was announced on the day he was born.

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