What is the least popular language in Europe?

Determining the least popular language in Europe can be subjective, but many consider certain regional or minority languages to be among the least spoken. For example, languages like Livonian in Latvia or Manx in the Isle of Man have very few speakers. These languages face challenges in terms of preservation and use, often having only a handful of fluent speakers left. Overall, the popularity of a language can vary significantly based on cultural, historical, and social factors.