The phrase "astonishing popularity" is correct and usable in written English.
It can be used to describe something that has gained an impressive or surprising level of popularity.
Example: "The new smartphone model has gained astonishing popularity among tech enthusiasts and casual users alike."
Alternatives: "remarkable popularity" or "incredible popularity".
Since founding Facebook Zuckerberg has seen it acquire astonishing popularity at a very fast pace.
Despite these efforts, Iran was able to achieve astonishing popularity on the Arab street.
One reason for the Beatles' astonishing popularity by the end of the 1960s was precisely that they did not distinguish between the "authenticity" of, say, Chuck Berry and the "artifice" of the Marvelettes.
Performing 12 sell-out shows in New York's Madison Square Gardens, the astonishing popularity of their singalong live shows has seen them beat competition from a host of multinationals, including Qantas and Macquarie Bank, to be named Australia's exporter of the year.
When the time comes for us to reflect even more closely on the cultural markers of this generation, we will note the increased use of social media, the astonishing popularity of "haul videos" on YouTube, overblown sentiments on reality television shows ("this is my last chance, Simon Katieatie, 19), and naturally, the stratospheric rise of the selfie.
Fortnite's astonishing popularity isn't only causing a headache for other video games.
Together they symbolised England's hopes of turning the Premier League's astonishing global popularity into a second World Cup trophy in the FA's cabinet.
Microbloggers, some of whom have attracted millions of followers, have been exposing scandals and official malfeasance, including an attempted cover-up of a recent high-speed rail accident, with astonishing speed and popularity.
Ardern, who at 37 is the youngest leader to ever take charge of the beleaguered Labour party in New Zealand, has experienced an astonishing surge in popularity since taking over on 1 August, increasing her party's polling results by 19 points in just over a month.
What's new is this genre's astonishing frankness, its wide popularity and its active, earnest attempt to lend troubled fans a helping hand.
For a product invented in 1963, just as the harm caused by tobacco was starting to become widely known, the recent surge in their popularity has been astonishing.
