Manusmriti

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आपो नारा इति प्रोक्ता आपो वै नरसूनवः । ता यदस्यायनं पूर्वं तेन नारायणः स्मृतः ॥ १० ॥

sanskrit

The waters are called narah, (for) the waters are, indeed, the offspring of Nara; as they were his first residence (ayana), he thence is named Narayana.

english translation

Apo nArA iti proktA Apo vai narasUnavaH | tA yadasyAyanaM pUrvaM tena nArAyaNaH smRtaH || 10 ||

hk transliteration by Sanscript