Prince Charles has joked his one-week-old grandson George will be called Georgie "in no time".
The third-in-line to the throne was born last Monday in a London hospital and went home a day later.
Outside the Lindo Wing of St Mary's, George Alexander Louis was photographed with his parents, the Duke and Duchess of Cambridge, in front of the world's media.
HRH Prince George of Cambridge is set to be known as King George VII when he one day becomes king.
As they attended the Whitstable Oyster Festival in Kent, Charles and his wife the Duchess of Cornwall were congratulated on the new arrival by throngs of well-wishers.
And Charles gave the newborn's name the Royal seal of approval, describing George as "very good".
But Sonia Rule, 38, whose partner works for the Whitstable RNLI Lifeboats crew said she heard Charles joke his grandson will "be known as Georgie in no time".
The Royal couple were showered with gifts for the baby including a tiny lemon T-shirt which they could pass on as a souvenir from their trip to the festival.
Shona Corcoran, 38, from Whitstable, and her three-year-old daughter Hannah gave Charles the gift.
"He said, 'Oh, that's fantastic, thank you. I'm sure he'll like to wear that'," she said.
Charles met a woman who also has a grandchild called George.
Margaret Quinney, 67, said: "He was talking about the grandchildren. He said there are lots of grandparents around."
It was after Charles met Mrs Quinney and her daughter Jo that he said: "George - a very good name."