As a deity name
Name 295 of the Saraswati Sahasranāma — Skanda Purana, as taught by Lord Brahma / Sages
As a Hindi name
मंत्र · masculine
mantra, chant
a Hindi word, a tatsama: the Sanskrit word borrowed unchanged into Hindi मन्त्र — per Wiktionary’s etymology record
“Borrowed from Sanskrit मन्त्र (mantra).” — per Wiktionary’s etymology record
mantra m. (rarely n.; ifc. f(ā). ), ‘instrument of thought’, speech, sacred text or speech, a prayer or song of praise, RV.; AV.; TS.
a Vedic hymn or sacrificial formula, that portion of the Veda which contains the texts called ṛc or yajus or sāman (q.v.) as opp. to the Brāhmaṇa and Upaniṣad portion (see IW. 5 &c.), Br.; GṛŚrS. &c.
As a Sanskrit word
Meaning
mantra, chant (a Hindi word, a tatsama: the Sanskrit word borrowed unchanged into Hindi मन्त्र; per Wiktionary’s etymology record)
Scripturally attestedWhy this matches what you typed
No corroborated Sanskrit reading of this spelling is established. It resolves as a Hindi word — see “As a Hindi name” above. We say this plainly rather than force a Sanskrit story onto it.
Caveats
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