Well, definitely not Basque. Basque is a language isolate, like Burushaski and Sumerian. It definitely is related to other languages at some time depth, but the

Well, definitely not Basque. Basque is a language isolate, like Burushaski and Sumerian. It definitely is related to other languages at some time depth, but the depth is so great that this relation is impossible to discern now with any confidence. And I don't think anyone with any credibility currently argues that its closest extant relations are languages like Finnish and Hungarian whose homeland is north-central Asia.