Prince William and the Duchess of Cambridge have named their third child Louis Arthur Charles.

Kate gave birth to the 8lbs 7oz baby boy at St Mary's Hospital in Paddington, central London, on Monday.

Today Kensington Palace said: 'The Duke and Duchess of Cambridge are delighted to announce that they have named their son Louis Arthur Charles.

'The baby will be known as His Royal Highness Prince Louis of Cambridge.'

The fifth in line to the throne was born on Monday April 23, weighing 8lb 7oz.

William and Kate's third child, the prince is the younger brother of Prince George and Princess Charlotte, and the Queen and the Duke of Edinburgh's sixth great-grandchild.

MORE - click here for all our Royal baby coverageMORE - Royal baby will spend part of childhood in NorfolkThe names of Prince George and Princess Charlotte were both revealed two days after they were born.

William appeared to hint at his preferences for naming his newborn son when he remarked on a guest's 'strong name' when he joined Prince Harry and Meghan Markle at an Anzac Day service in London yesterday.

Australia's High Commissioner Alexander Downer suggested he should call the boy Alexander.

The Prince replied: 'Well, it's funny you should say that. It's a good name.'

Asked how the Duchess and the baby were, the Duke replied: 'They're very well thanks.'

He said they are 'in good form, luckily', and added: 'Sleeping's going reasonably well so far, so he's behaving himself which is good news.'

Earlier bookmakers reported a late flurry of bets on Albert - the name of Queen Victoria's beloved consort, and the actual first name of the Queen's father George VI.

Coral said Albert was at 5-1, but a Prince Arthur remained the favourite at 5-2, closely followed by James at 4-1.

Philip - in tribute to the Duke of Edinburgh - was at 8-1, Alexander 10-1, Henry 12-1, and Frederick, Edward or Thomas 16-1.

William and Kate shared the name with the Queen and the rest of their family before making it public.

The Queen's father, George VI, was actually Albert Frederick Arthur George and always known to his family as Bertie.

Shy, stammering Bertie was forced to become king when his brother Edward VIII abdicated, but won the nation's affection by standing firm in London during the Second World War.