Here's a breakdown:
* Within Vietnam: The official number is around 90 million native Vietnamese speakers.
* Worldwide: Estimates range from 80 million to 100 million, including those in Vietnam and the diaspora communities.
Factors influencing the number:
* Diaspora communities: Vietnamese people have emigrated to many countries, creating large communities in the US, Canada, Australia, France, and others.
* Language acquisition: Children born in these communities may not be fluent or may have a stronger command of their adopted language.
* Official language status: Vietnamese is the official language of Vietnam, but its status in other countries varies.
It's important to remember that these are estimates, and the actual number of Vietnamese speakers could be higher or lower.