Kylie later updated the photo to include Stormi's last name: Webster.
Some were surprised to not see 'Jenner' or 'Scott,' however, Travis' last name is actually Webster (and his first name is Jacques). Rappers these days.
TMZ has now got their hands on the newborn's birth certificate, confirming her full name is Stormi Webster, which means Kylie chose not to give her daughter a middle name.
This follows on from big sister Kim Kardashian West's naming style, as Kim chose not to give her three children middle names.
It makes sense that the pair chose not to. After all, Stormi, Chicago, Saint and North are all unique enough on their own.
Unlike their siblings, Kourtney and Rob Kardashian have given their children middle names. Kourtney is the proud mother to Mason Dash Disick, Penelope Scotland Disick, Reign Aston Disick, and Rob is the doting dad of Dream Renée Kardashian.
Congratulations again to Kylie and Travis!
This article originally appeared on InStyle Australia