A signed birth certificate from Cedars-Sinai Medical Center in Los Angeles reportedly revealed the information -- which would make the child's name North West (no middle name).
The baby was born five weeks early on June 15 and is the couple's first child.
But back to the name: It's the joke Jay Leno threw out as "rumored" when Kardashian visited "The Tonight Show" -- and which the reality TV star denied was on their list of names.
"I like Easton. Easton West. I think that's cute," she told Leno at the time.
E! sources say the child will be called "Nori" for short.
Well, at least it's not "Knorth." And thus far, no reported connection to the 1994 movie stinker "North."
Meanwhile, celebrities have wasted no time jumping on the joke bandwagon about the name; Jason Biggs tweeted: "I lost my office pool. I had Ratings Spike Kardashian-West," while "Modern Family" co-creator Steve Levitan also tweeted, "What a ridiculous name, said Wayne Dwop."