As a deity name
Name 864 of the Vishnu Sahasranāma — Mahabharata (Anushasana Parva), as taught by Bhishma to Yudhishthira on his deathbed
As a Hindi name
नियन्ता · niyantā · s.m.
(f. -trī), A restrainer; a ruler, governor; master — Platts (1884), digital edition courtesy DSAL, University of Chicago, p. 1170
As a Sanskrit word
Meaning
who or what holds in or restrains or governs or tames, &c., &c. (-tva, )
Scripturally attestedWhy this matches what you typed
M1 · same meaning "niyantā" is the nominative of "niyantṛ" — the same word in a different grammatical case.
Dictionary citations
ni-˚yantṛ m. who or what holds in or restrains or governs or tames, &c., MBh.; R. &c. (-tva n., Vedāntas.)
ni-˚yantṛ m. a restrainer, governor, tamer (esp. of horses), charioteer, MBh.; Ragh.
Caveats
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