Mason, Penelope, Reign and… Rocky?

Fans believe pregnant Kourtney Kardashian accidentally revealed the name of her and Travis Barker’s son in a since-deleted baby shower photo.

The reality star gave her followers a glimpse of a Wishing Tree for her upcoming arrival via Instagram Stories Sunday.

Although the Poosh creator, 44, quickly removed the social media snap, one eagle-eyed Reddit user captured a screenshot and zoomed in on a note hung from the tree.

The message, although blurry toward the end, began with, “May Baby Rocky…”

Many shared their reactions to the possible moniker in the comments section.

“Rocky Barker either sounds like a protein bar or a late 90s/early 2000s cartoon,” one Reddit user wrote, with another joking the name could be “short for Rockstar.”

A third fan wrote, “I assumed it was a nickname because it’s a very punchy/kicky baby. Lord I’m too normal for these people.”

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Others, however, expressed doubt that Rocky will be the little one’s name since Barker, 47, already shared the possibility in an episode of Complex’s “GOAT TALK” in July.

When the Blink-182 rocker admitted to liking “Rocky 13” as an option, his 17-year-old daughter, Alabama, roasted him.

“That’s so bad!” she exclaimed — and the drummer agreed.

However, he explained his reasoning to the teen, saying, “Rocky George played guitar for Suicidal Tendencies. And 13 is just the greatest number of all time. And ‘Rocky’ [is] the greatest boxing movie of all time.”

The previous month, the Grammy nominee wrote via Instagram that he and Kardashian had “already” picked their son’s moniker.

The Lemme creator announced her pregnancy news at a Blink-182 concert in June, revealing the sex the following week. She underwent “urgent fetal surgery” earlier this month.

Kardashian is already a mom, as she shares Mason, 13, Penelope, 11, and Reign, 8, with ex Scott Disick. Barker, for his part, welcomed Landon, 19, and Alabama while married to ex-wife Shanna Moakler.