In some religious discourse given by Shri Bannanje Govindacharya, I heard him say that Shri Adi Shankaracharya had said
What is the source of it?
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It is ईश्वरः सर्वज्ञः नारायणाख्यः ईशनशीलः ॥ १७ ॥ in the Bhagavadgita Bhashya by Shankara for the verse 15.17.
It means: The omniscient Ishwara, Lord, by the name Narayana, is Ishanashiila - the one who is of the nature of ruling, governing, the jivas and jagat. This expression Shankara has made more than once.