Yaghan (also known as Yamana) is a language isolate of South America, not known to be related to any other living language.
It was once spoken in Tierra del Fuego. As of 2011 only one elderly Yamana woman still speaks the language fluently, but one of her granddaughters
is working to record, learn and teach the language again.
Lord's Prayer in Yaghan:
Translations of Christian prayers into the Yaghan language.
Wikipedia article about the Yaghan (Yamana) language.
Demographic information about Yaghan from the Ethnologue of Languages.