Devibhagavatapurana 3.30.37

3.30.37

akārādikṣakārāntaiḥ svarairvarṇaistu yojitaiḥ |
asaṅkhyeyāni nāmāni bhavanti raghunandana ||

O descendant in the race of Raghu! Her endless names are formed by the various combinations of the various vowels and consonants from the letter ‘A’ to the letter ‘Ksa.’”