A quick search seems to confirm this. A few sites list the number to be around ~1.3 billion people who speak English at all, with around ~360-380 million being native speakers. For example: https://www.babbel.com/en/magazine/how-many-people-speak-eng....

https://www.statista.com/statistics/266808/the-most-spoken-l...

> first language?

1/3 of the global population is at all, there’s only 380 million native English speakers.

US, UK, Canada, Australia is where you find the bulk of native speakers. In say Germany or whatever they may become fluent but it’s relatively rare for German parents to be speaking English to each other in casual conversation next to an infant’s crib.