SB 12.11.21
vasudevah sankarsanah
pradyumnah purusah svayam
aniruddha iti brahman
murti-vyuho ’bhidhiyate
Translation:
Vasudeva, Sankarsana, Pradyumna and Aniruddha are the names of the direct personal expansions of the Supreme Godhead, O brahmana Saunaka.