'Barbie' And 'Ken' Baby Names Spike In Popularity After Movie Success

"Barbie"s worldwide box office domination has expecting parents thinkin' plastic when it comes to baby names ... because folks are interested in naming their kids after the popular dolls.

BabyNames.com tells TMZ ... their site has seen a 300% uptick in searches for "Barbie" in the month of July. "Ken" has also blown up, with searches increasing by 200% in the same month.

Not as much as Barbie, but that holds up -- he's just Ken.

We're told a handful of users are also adding the titular names to their favorites list. According to the website, Barbie means "stranger," while Ken means "handsome." Barbie peaked in popularity in 1964, while Ken peaked in 1963.

As we reported, the Greta Gerwig flick has been crushing it in theaters -- it pulled over $162 mil in the U.S. alone in weekend one ... and it's already passed $1B worldwide.

The fan-favorite character, Allan -- played by Michael Cera -- has had a positive outcome on the Mattel reseller game ... because eBay listings for the rare doll have skyrocketed after the movie's release.

Sadly, we're told there's been no search increase for the name "Allan" when it comes to baby names. Sorry, dude.