As a deity name
Name 162 of the Gayatri Sahasranāma — Devi Bhagavata Purana, as taught by 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 young girl, one from ten to twelve years old, maiden, daughter, &c.
Scripturally attestedWhy this matches what you typed
M1 · same meaning "kumāryai" is the dative of "kumārī" — the same word in a different grammatical case.
Dictionary citations
kumārī (ī), f. a young girl, one from ten to twelve years old, maiden, daughter, AV.; AitBr. &c.
or (in the Tantras) any virgin up to the age of sixteen or before menstruation has commenced
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