* Lack of Comprehensive Data: There are thousands of languages spoken around the world, and many of them are small, isolated, and poorly documented. It's difficult to gather accurate data on the number of speakers for all these languages.
* Dynamic Nature of Language: Languages are constantly evolving and dying out. New languages can emerge, and old languages can disappear, making any list of "least spoken" languages temporary.
* Definition of "Language": It's not always easy to distinguish between a language and a dialect. Some languages are only spoken by a small number of people, while others are simply considered dialects of a larger language.
However, we can say that many languages spoken by indigenous communities, particularly in remote areas, are likely to be among the least spoken. These languages often have limited documentation, and their speaker populations are small and declining.
Instead of focusing on a single "least spoken" language, it's more important to recognize the diversity and vulnerability of languages around the world. Language extinction is a real concern, and we need to work to preserve and revitalize endangered languages.