“The generic name Actaea is derived from the Greek aktiai, meaning elder, to which the leaves bear resemblance; rubra alluding to the red berries…” (source)
Most of the sources I’ve found say that the berries can also be white, although Ontario Wildflowers lists the white baneberry as a separate species (A. pachypoda). There are some good photos on that site as well, although their description of the berries of the red baneberry as ‘china white’ is a little confusing.
All parts of this member of the buttercup family are poisonous although several sources claim that native people did use it medicinally. “The name Baneberry refers to the plant’s toxicity, being derived from the Anglo-Saxon word for ‘murderous’ – bana.” (source)
It is apparently quite unpalatable, and there have been no reported deaths from it in North America. The European species has been linked to the deaths of children. (source) Some birds and small animals are able to digest it.