In keeping with the rest the family, the Olivers have given their latest bub a truly unique moniker.
Jamie Oliver's wife, Jools, announced the name on Instagram two weeks after the birth of the baby boy.
The post showed an artwork reading, "Dream Big River", which all but confirms the child's name as 'River'.
Many were quick to point out the connection with the much-loved actor, River Phoenix.
The name is on theme with the rest of Jamie and Jools' children, who also sport unique names.
River is the youngest of the five children, following Poppy, 14, Daisy, 12, Petal, six, and Buddy, five.
Jamie Oliver is clearly a happy father, posting numerous photos of his wife and newborn on social media.
Last week, the celebrity chef shared an adorable snap of him bathing little River.
"I can never get over how small they are, his hands are as big as my thumb....he wouldn't let go as he had his first proper bath..... All good making the most of time with the family before I go back to work soon," he captioned.