One verse

Srimad Bhagavatam 2.10.11

2.10.11

तास्ववात्सीत् स्वसृष्टासु सहस्रंपरिवत्सरान् । तेन नारायणो नाम यदाप: पुरुषोद्भवा: ॥ ११ ॥

tasv avatsit sva-srstasu sahasram parivatsaran tena narayano nama yad apah purusodbhavah

tasu
in that
avatsit
resided
sva
own
srstasu
in the matter of creation
sahasram
one thousand
parivatsaran
years of His measurement
tena
for that reason
narayanah
the Personality of Godhead named Narayana
nama
name
yat
because
apah
water
purusa-udbhavah
emanated from the Supreme Person.

That Supreme Person is not impersonal and therefore is distinctively a nara, or person. Therefore the transcendental water created from the Supreme Nara is known as nara. And because He lies down on that water, He is known as Narayana.