Skandapurana 16.114.6

16.114.6

pūrvaṃ sā puṣkare prāptā puṣkarātsā mahānadī ..
puṣkaraṃ kathyate vyoma puṣkaraṃ kathyate jalam ..
tena tatpuṣkaraṃ khyātaṃ saṃnidhānaṃ prajāpateḥ .. 6 ..

First it reached Puṣkara; from Puṣkara [flowed] that great river. / The sky is called 'puṣkara', water is called 'puṣkara'; / therefore it is known as Puṣkara, the dwelling place of Prajāpati.