* No official census: There's no official global census specifically for Sylheti speakers.
* Part of Bengali: Sylheti is often considered a dialect of Bengali, making it hard to distinguish speakers from those who speak other dialects.
* Regional variation: Sylheti is spoken in various regions, including Bangladesh, India (Assam and Tripura), and the UK. The number of speakers varies greatly within each region.
However, here's some information to give you an idea:
* Estimated range: It's estimated that between 10-15 million people worldwide speak Sylheti.
* Largest concentration: The majority of Sylheti speakers reside in Bangladesh and the Sylhet division in particular.
It's important to note that these are estimates and the actual number of Sylheti speakers could be higher or lower.