Skandapurana 6.3.230.13

6.3.230.13

nāmanirvacanaṃ tadvattathā kalpasamudbhavāḥ .
ekaviṃśatikalpānāṃ tadvannāmānukīrtanam .. 230.13 ..

likewise the etymological explanation of names, and the origins of the aeons, / as well as the enumeration of the names of twenty-one aeons;