As a deity name
Name 419 of the Gayatri Sahasranāma — Devi Bhagavata Purana, as taught by Sages
Name 882 of the Saraswati Sahasranāma — Skanda Purana, as taught by Lord Brahma / Sages
As a Hindi name
No reading on this path — this spelling has no entry in our Hindi sources, and no near neighbour is attested there either. We say so rather than invent one.
As a Sanskrit word
Meaning
a slender or delicate woman, &c.
Scripturally attestedWhy this matches what you typed
M1 · same meaning "tanvyai" is the dative of "tanvī" — the same word in a different grammatical case.
Dictionary citations
tanvī (vī), f. a slender or delicate woman, Śak.; Mālav. v; Bhartṛ. &c.
Desmodium gangeticum, L.
Caveats
Sources contain errors and engines have limits; every claim above carries its citation so you can verify it. This is guidance about names and their sources — not religious or astrological consultation. How we work · Our sources