Khloe Kardashian legally changes son Tatum’s name after first keeping moniker secret for 2nd child with Tristan

, new parents can pick whether they'd like their child to have the father's last name, or their mother's last name - or both.

Whichever the parent chooses becomes permanent, unless a court order dictates otherwise.

Khloe and Tristan, 32, welcomed their son via surrogacy in July 2022.

They have called him Tatum but apparently never set his full name in stone.

The pair also share daughter True, 5.

JOHN KHLO

The baby's birth came after Tristan cheated on Khloe with Maralee Nichols and secretly fathered a son with her.

A source claimed to that Tatum was listed as a Kardashian when he was born.

And that his first name wasn't her son's original first name she wanted, but the source didn't reveal what her initial choice was.

A source said Khloe resisted nudges from her family, especially from mom Kris Jenner, to give the first name of Robert to the baby after Khloe’s late father, Robert Kardashian, and brother Rob.

Instead, she decided to use Robert as the boy’s middle name in honor of her lawyer dad, who passed away almost 20 years ago in September 2003, and her beloved younger brother, according to the source.

The insider said: “There was talk about whether it should be Tatum Robert or should it be Robert Tatum. 

“Some in the family were leaning more towards Robert because it honors her dad and her brother.

"Kris in particular was keen for the baby to be called Robert and was steering Khloe towards that.  

“It took Khloe a little while to settle on the name but ultimately she went with Tatum Robert, which is in keeping with Tristan and True’s names starting with a T."

The insider continued: "Khloe wanted a name that was kind of unusual but not too out there and also keeping with the T theme.”

'WHAT'S DONE IS DONE'

NBA star Tristan is also dad to son Theo, 16 months, with Maralee Nichols, and Prince, six, with model ex-girlfriend Jordan Craig. 

Tristan revealed in January 2022 that he secretly fathered a son with his mistress, fitness model Maralee, 31, in 2021.

Following a month of speculation, Tristan confirmed he is son Theo's father and issued a public apology to Khloe.

It was revealed that Khloe and Tristan had conceived another child via a surrogate just before she learned about his cheating scandal.

Khloe revealed on Hulu's The Kardashians that she and Tristan are not "getting back" together and are co-parenting.

"Tristan and I, we always get along great.

"Him and I have a great friendship relationship, we get along fine, and for my kids, I will put anything to the side," she said.

"What's done is done, so what would I still be holding on to something for? I don’t need to 'punish' him because I'm not getting back with him."

'HARD PROCESS FOR ME'

Last month, Khloe also admitted she felt disconnected from Tatum because she had him via a surrogate.

The Good American founder was mixed the process of surrogacy, which she called transactional, and said she felt guilty that another woman gave birth to her child.

She reflected on the journey during a conversation with her sister Kim and Scott Disick during The Kardashians Season 3 premiere.

Khloe said: "The surrogate process, Kim knows, it's really hard for me."

In a confessional, Khloe shared: “I definitely buried my head in the sand during that pregnancy that I didn’t digest what was happening.

"So I think when I went to the hospital, I really think that was the first time it really registered.

"It has nothing to do with the baby but I was in a state of shock I think because of my entire experience in general.

"I felt very guilty that this woman just had a baby and then you take the baby and go to another room."

Khloe went on: "It’s such a transactional experience because it’s not about him.

"I wish someone was honest about surrogacy and the difference of it. It doesn’t mean it’s bad, it’s just different.”