The choice also honours Mountbatten, Charles' great-uncle and beloved mentor, who was killed by an Irish Republican Army bomb in 1979.
He is William Arthur Philip Louis, while Prince Louis's older brother Prince George is already George Alexander Louis. It's also the name of great-grandfather Prince Philip's grandfather. Prince Charles, the baby's grandfather, is first in line to the throne.
He arrived two days after his great-grandmother the queen's 92nd birthday on April 21.
He is also the first male royal who will not overtake his sister in the line of succession after the reform that ended male primogeniture. All guests named Louis need to do is bring along valid ID when they visit the park. "Arthur" was a middle name of Queen Elizabeth II's father King George VI, according to the BBC.
Apple investors express concern as iPhone sales stall
KGISecurities analyst Ming-Chi Kuo states that Apple will opt for a new display which is not compatible with 3DTouch. A few months ago, there were reports that Apple was planning to release three new iPhones this year.
Do you like the new royal baby name? The vast majority of people are having some fun. The couple may be leaving the option of using the name to Prince Harry, who will Wednesday Meghan Markle on May 19.
He said betting spiked after the baby was born and that bookies take bets right up until the moment of an official announcement, unless they believe someone has inside information. "We lost about 10,500 quid because of that", he said.
Both George and Charlotte attend local schools close to home - in stark contrast to William and Prince Harry's own experiences at boarding school outside of London - and the new prince is likely to follow suit.
On Thursday evening William suggested that the couple were still deciding on a name, telling reporters who asked about it: "I'm working on that". His name was announced on the day he was born.
It comes just before their daughter's third birthday. The couple emerged from St. Mary's Hospital on Monday evening with Duchess Catherine cradling the sleeping baby, wrapped in a white blanket, in her arms.