Is Riddick the last Furyan?

I'm curious, is Riddick truly the last Furyan? It's a bold claim, given the vast and mysterious history of the Furyan race. Have there been no other survivors of their kind? Have we exhausted all possibilities of uncovering any hidden Furyans in the corners of the universe? Or is this just a sensationalized rumor, designed to add intrigue to the story? I'd love to hear your thoughts on this matter, and any evidence that might support or refute the notion that Riddick is indeed the last Furyan.