Revākhaṇḍa of the Skandapurāṇa manuscripts (RKS) 109.72

109.72

pitāmahena bālo 'sau jātamakarmādi saṃskṛtaḥ /
dvaipāyano dvīpajanmā pārāśaryaḥ parāśarāt //

The birth rites and other ceremonies were performed for the boy by the Grandfather:
"[He is] Dvaipāyana because born on an island, Pārāśarya because of Parāśara;