He was originally the tutelary god of Borsippa, near Babylon, and appears in the name of an ensi (governor) of the area from the Ur III period, Puzur-Tutu.
Borsippa, a city close to Babylon, had a god that served as its protector; this deity's name was used in the title of an ensi (governor) during the Ur III period, specifically for Puzur-Tutu.