Kardashian-West and her husband of three years are parents to one-year-old son Saint and four-year-old daughter, North. Then it was Saint.
Meanwhile, sources tell The Blast Kim and Kanye left the decision to name their little girl Chicago so late, the new moniker didn't make it onto the baby's birth certificate, which was filed with the Los Angeles County vital records office.
Ashley Boice, also in Chicago, said she isn't surprised by the unusual name.
While there isn't an explanation behind the baby name yet, it's important to note that Kanye grew up in Chicago.
West was raised in the United States city Chicago.
As Kim explained on "The Ellen De Genres Show" prior to the baby's birth, "We don't have a name".
That's right the new baby girl will be known as "Chicago West". Kimye is living it up in the baby naming department, after all, North West (4) and Saint West (2) are very creative and unique names that totally fit both of their adorable kids.
Followed by four heart eye emojis, Khloe showed her approval of the name choice while also confirming that the nickname of the newest member of the Kardashian's expanding empire will be Chi, identical to the fond moniker of the famous IL city.
Kim's sister Khloé, who is now pregnant with her first child, was quick to praise the name, revealing to her 25 million followers that she "loved" it."I LOOOOOOOOOOVE her name hey Chi (shy)", the proud auntie said.
At that time, the couple said it was "incredibly grateful to our surrogate who made our dreams come true", Kardashian West says.