UPDATE: On Wednesday, Jamie Oliver confirmed his son's full name in an Instagram post.
"His name's River Rocket Oliver we think it suits him and he's a little gift and we are all very happy," the dad-of-five wrote.
On Monday, Jools posted a photo of their son’s nursery art to Instagram, which reads “Dream Big River.” She then captioned the snap with a rocket and heart emoji, causing many to believe the baby’s full name is River Rocket.
According to Mirror UK, Oliver’s sister, Anna-Marie Hunt, only further fueled rumours of the baby's full name when she left a comment on the post, saying: “It's all about the River today!” The proud new aunt also added a wink, rocket and monkey emoji.
The British chef’s quirky baby name choice comes as no surprise, as Oliver and his wife have always loved unique nature names. In fact, their four older kids are Poppy Honey Rosie, 14, Daisy Boo Pamela, 13, Petal Blossom Rainbow, 7, and Buddy Bear Maurice, 5.
On social media, Oliver’s fans praised the name the couple chose for their newest addition. “Aww lovely and so apt as rivers flow out to the sea,” one wrote.
Another said: “Loving the name goes with all your other beautiful names and children you must be very proud.”
River is actually a very trendy moniker not only because it’s a nature name, but because it’s unisex, too. In fact, recent research by Nameberry revealed that River is actually one of the top gender-neutral names of 2016, coming in at number six.
Other celebrities have also chosen this name for their kids. Megan Fox and Brian Austin Green, for instance, recently welcomed their third son and named him Journey River. And back in 2014, Kelly Clarkson gave birth to a daughter and named her River Rose.
Of course, arguably the most famous River is the late actor River Phoenix.
While fans all agreed that River is a beautiful name choice, some didn’t understand where Rocket came from.
Apparently Jamie Oliver's new son has been named River Rocket....River I get, it's a cool name, but Rocket? Because of his love of salad?
— Mrs H (@TheNostromo_) August 23, 2016
While Oliver and his wife have not confirmed that their son’s middle name is Rocket, we can understand why they might have chosen it. After all, the name choice has proven to be fashionable in Hollywood. Just last year, “Avatar” star Sam Worthington named his son Rocket Zot.
Additionally, word names are becoming increasingly popular among celebrities. Jena Malone’s son is Ode Mountain, Jeff Goldblum’s son is Charlie Ocean and Zooey Deschanel's daughter is Elsie Otter, for instance.
So maybe River Rocket isn’t so odd after all.