Whew, not that Mario!

Millennials breathed a sigh of relief when they realized the Mario Cuomo who died last Thursday was “only” ’ the former governor of New York — and not the rock-and-roll frontman of the same name.

“For a moment there when I saw Mario Cuomo is trending, I thought the lead singer from the Orwells had died. #Phew,” user @Stijntsje tweeted.

When news broke of the passing of the legendary 82-year-old orator, the Chicago punk band The Orwells tweeted “Rip Mario Cuomo.”

The apparently tongue-in-cheek tweet — the band’s lead singer is 21-year-old Mario Cuomo from ritzy Elmhurst, Ill. — was enough to send worried fans into a moshpit of melancholy.

Other fans of the band — which dialed up a spirited performance last year on “Late Show with David Letterman” — shared similar reactions.

And user @rachelannimal blithely showed a bit of political incorrectness: “OK mario cuomo is trending and i was convinced that kid from the orwells died or something but it’s just NYC’s old mayor, eh.”