Possibly derived from Sumerian (n)in-an-na "lady of the heavens". Inanna was the Sumerian goddess of the earth, love, fertility and war. She descended into the underworld where the ruler of that place, her sister Ereshkigal, had her killed. The god Enki interceded, and Inanna was allowed to leave the underworld as long as her husband Dumuzi took her place.