* Data on language speakers is often incomplete or inaccurate. There are many languages spoken by small, isolated communities that are not well documented.
* The definition of "least known" is subjective. It could refer to the number of speakers, the amount of research done on the language, or how widely it is taught or used.
However, we can make some educated guesses:
* Many undocumented languages exist, particularly in remote areas like the Amazon rainforest or the islands of the Pacific Ocean. These languages may only have a few dozen speakers and are often threatened by extinction.
* Languages spoken by small indigenous groups are often less well-known. These groups may have limited contact with the outside world and their languages may not be documented or studied.
* Languages with limited use and few resources are also likely to be less known. This could include languages that are primarily spoken in oral traditions or that lack a written form.
Ultimately, it's difficult to say for certain which language is the least known. However, the existence of many undocumented languages highlights the importance of language preservation and the need to understand and document the diversity of human communication.