The latest addition to the royal family has been named Prince George Alexander Louis, but where did the Prince get his names?
The Duke and Duchess of Cambridge have named their son George Alexander Louis, Kensington Palace said.
With the imminent arrival of the Duke and Duchess of Cambridge's firstborn here are some of the more unusual facts about royal babies.
Villagers in Hetton-le-Hole in County Durham can boast remarkably strong ties to the new royal baby. Kate Middleton's great-grandparents were born there and many of their descendants - her cousins - still live there. They are now related to the future king.
As the nation waited for a first glimpse of the new royal baby, people from around the North East had their own reasons to celebrate - including baby Ella Kate Watson, who was born at the same time in the Queen Elizabeth Hospital in Gateshead.
She qualifies for a commemorative five pound coin issued to all infants who now share a birthday with the new prince.
The Millennium Bridge over the River Tyne will be lit up blue tonight, to mark the arrival of the royal baby boy.
John Harrison, who is Kate Middleton's first cousin twice removed, said he was "over the moon" that he is now related to the future King of England.
He and his wife Val still live in Hetton-le-Hole, County Durham, where the Duchess of Cambridge's great-grandparents once lived.
Members of Kate Middleton's extended family in the North East have said they are "over the moon" with the arrival of the new royal baby.
The Duchess of Cambridge's great-grandparents grew up in Hetton-le-Hole, in County Durham.
Her first cousin twice removed John Harrison, who still lives in the village, said it was a shock at first to realise that he is now related - however distantly - to the future King of England.
A knitted version of the royal baby boy has been spotted outside the Outer West Library in Newcastle.
Oh my gosh!!! It's a boy, A little Prince :) How amazing! :D #CONGRATULATIONS Perrie <3
I'm so excited for the royal baby!! ????
The former Bishop of Durham, Justin Welby, has expressed his happiness for the Duke and Duchess of Cambridge.
Delighted for the Duke and Duchess of Cambridge as they welcome their baby boy. May God bless them all with love, health and happiness.