18Cormac, John O'Donovan, and Whitley Stokes. Sanas Chormaic (Cormac's Glossary). Calcutta: Printed by O.T. Cutter for the Irish Archeological and Celtic Society, 1868. 17. This may be read in its entirety here.
Ronald Hutton put his own gloss on this: "[In the Glossary] she is called the mother of all deities, a further inflation of status from being the founder of her great Tuatha. But another text, Cóir Anman ('The Fitness of Names'), calls 'Anu' the tutelary goddess of the province of Munster, where indeed twin mountains are still said to represent her breasts. If Danu, Ana and Anu are the same then it is possible that a local goddess grew into a generalized one, perhaps aided by the fact that Cormac was a Munster leader. (Hutton, Ronald. The Pagan Religions of the Ancient British Isles: Their Nature and Legacy. Oxford: Blackwell Publishers, Ltd. 1991. 153.)