 Wunnumin Lake is called "Wanaman-zaaga'igan" meaning "Vermillion Lake", in reference to the vermillion-coloured clay about the lake.Legend says that "Wiisagejaak" (the "Crane "manidoo"") used to hunt for food, found "Big Beaver" that lived on the Pipestone River and chased "Big Beaver" and its baby beaver to this area.When "Wiisagejaak" caught up with "Big Beaver" and its baby beaver, he killed the baby beaver and put it aside in this particular area with foliage; as the baby beaver laid there in this foliage, it bled from its wound.