Jamie and Jools Oliver appear to have revealed the name of their newborn son.

Jools hinted the baby is called River in an Instagram post reading “Dream Big River” in caps.

She left no additional remark with the image apart from an emoji of a rocket and another of a heart.

🚀 💙

A photo posted by Jools Oliver (@joolsoliver) on

However, fans soon left comments under the post assuming the celebrity couple’s son is called River, or perhaps even River Rocket.

One Instagram user wrote: “Same name as my baby boy #River.’

Another added: “I thought it might be Rio – but River is lovely. He shall be a very much loved boy. Bless you all.”

Hanging out with my boy in the veg patch!! As you do … big love guys, happy Thursday jamie o xx X xx

A photo posted by Jamie Oliver (@jamieoliver) on

The celebrity chef and and his wife, who are both 41, welcomed their fifth child two weeks ago.

The couple, who have been married for 16 years, used social media to reveal the news of their son’s arrival, with Jamie posting a picture on his Facebook page of the sleeping baby swaddled in a blanket.

Morning Son ….. I can't imagine I'll ever take a better selfie, he's so sweet. Big love guys Jox X X X X X thanks for all your good wishes I really appreciate them X x

A photo posted by Jamie Oliver (@jamieoliver) on

He wrote: “And then this just happened guys!! It’s a baby boy!! Everyone in the Oliver family is very surprised and beyond happy.”

Oliver went on to reveal his son “arrived safely” weighing 8lb – the same as 16 packs of butter.

Little baby boy Oliver has arrived we are so very happy, blessed, grateful and totally in love all over again and so very proud of our two eldest daughters who cut the cord ❤️ Jamie was my hero 💙 (no name yet)!!! XXXX

A photo posted by Jools Oliver (@joolsoliver) on

The couple have also shared other snaps of their adorable little boy on social media, including a shot of Jools breastfeeding.

The Olivers also have three daughters – Poppy Honey Rosie, Daisy Boo Pamela and Petal Blossom Rainbow – and another son, Buddy Bear Maurice.