This is one of the various names for the Sumerian mother goddess. She is described as the “mother of the gods” and had a temple at Adab, as well as Kesh. The name means “Lady of the Mountains” and a Sumerian literary text, featuring Ninurta, provides an etymological narrative: Ninurta, having defeated a terrible demon and his stone warriors, turns them into a mountain and gives his mother, called Ninmah, this new name.
Historical Dictionary of Mesopotamia. EdwART. 2012.