As a deity name
Name 166 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
the daughter of a prince of the Kekayas (one of the wives of Daśa-ratha and mother of Bharata, )
Scripturally attestedWhy this matches what you typed
M1 · same meaning "kaikeyyai" is the dative of "kaikeyī" — the same word in a different grammatical case.
Dictionary citations
kaikeyī f. the daughter of a prince of the Kekayas (one of the wives of Daśa-ratha and mother of Bharata, R.; Ragh.), MBh.; Daś.
kaikeyī f. (-yī) One of the wives of DAŚARATHA, and the mother of BHARATA. E. kekaya a king, father of this lady, and ḍhak aff.
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