In comments to my previous post, reader Ed points to an interesting Deutsche Welle article on Livs/Livonians, the nearly extinct indigenous ethnic group in Western Latvia.
The article says that the number of native speakers of Livonian is less than a dozen (even less than what I said in my previous post). But the younger people of Liv descent are trying to learn the language and keep it alive. I hope they succeed!
As a side note, I find it amusing that English uses the word "Livonian" for two entirely different things: