That's according to Fanatics, which runs the official NFL online shop and is the world's largest online seller of licensed sports merchandise.
The private company won't divulge specific numbers, but a Fanatics official told ESPN that Barkley sold more jerseys on draft night than any other player in its history.
All drafts aren't exactly equal, as marketing speed gets quicker each year. On Thursday night, for example, Fanatics started selling jerseys within minutes of a player being drafted.
The previous best-seller for Fanatics on draft night was Johnny Manziel in 2014. Because Manziel was drafted 20 picks behind Barkley, the Giants' newest pick had a jump start of a couple of hours.
It won't be known until Sunday morning if Barkley's jersey lead will hold up, but within minutes of his selection, new teammate Odell Beckham Jr. was predicting even bigger things.
Btw 26 in the big blue jersey WILLL be the number one sellin Jersey in America next year. Takin all bets!!!? @saquon can't wait Lil brudda— Odell Beckham Jr (@OBJ_3) April 27, 2018
Jerseys ordered Thursday night will not be processed until the player picks a number. Fanatics says it will then take two to four weeks to get to the customer.
No player on the Giants currently wears No. 26, the number Barkley wore with the Nittany Lions.
Due in part to faster pushing to both online and social, Fanatics said jersey sales for this year's first round were three times bigger than last year. The company said its total NFL merchandise business is up 40 percent year over year.