What is Prince William's last name? Many are wondering that as the royal baby has just arrived and will need a name of course, but many don't know what Prince William's surname is.

Prince William isn't typically called by his surname and although Kate Middleton has a known last name, she is called Catherine, Duchess of Cambridge. Prince Harry and Prince William get their last name from their father, Charles, Prince of Wales. They go by the names William Wales and Harry Wales. Prince William is known as William Wales when he is in the military.

A last name is not required for the royal baby, as he will be given the title HRH Prince, but Kate and Prince William can choose a last name for their baby. They have three choices according to BBC.

The last name could be Wales, like Prince William. It could also be Cambridge, which is the royal house bestowed on his parents by Queen Elizabeth II when they got married. The third choice is Mountbatten-Windsor, which is a combination of Prince Phillip's last name, which he got from his maternal grandparents and the queen, whose father, King George V, chose Windsor for his family in 1917. Windsor was also the name of his castle.

The couple's first child was born on Monday, July 22nd. The baby boy was born at 4:24 p.m. and weighed 8 lbs, 6 oz.

Kensington Palace announced the birth through a press release which said. "The Duke of Cambridge was present for the birth," the statement added. "The Queen, The Duke of Edinburgh, The Prince of Wales, The Duchess of Cornwall, Prince Harry and members of both families have been informed and are
delighted with the news."

Both Kate and the child are doing well and will remain at the hospital overnight with Prince William. "We could not be happier," Prince William said via a palace spokesperson.