After conquering the enemy, the saintly king Purañjaya gave everything, including the enemy’s riches and wives, to Indra, who carries a thunderbolt. For this he is celebrated as Purañjaya. Thus Purañjaya is known by different names because of his different activities.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
जित्वा पुरं धनं सर्वं सश्रीकं वज्रपाणये । प्रत्ययच्छत्स राजर्षिरिति नामभिराहृतः
jitvā puraṃ dhanaṃ sarvaṃ saśrīkaṃ vajrapāṇaye | pratyayacchatsa rājarṣiriti nāmabhirāhṛtaḥ
SB 9.6.19