Nīlakaṇṭha-nāmotpatti-kathana
Origin of the Epithet “Nīlakaṇṭha”
प्रत्युवाच तदा देवान् सर्वांस्तान्पुरुषोत्तमः / श्रूयतामभिधास्यामि कारणं सुरसत्तमाः
pratyuvāca tadā devān sarvāṃstānpuruṣottamaḥ / śrūyatāmabhidhāsyāmi kāraṇaṃ surasattamāḥ
Then the Supreme Person replied to all the gods: “O best of the Suras, listen; I shall declare the cause.”