As a deity name
Name 827 of the Gayatri Sahasranāma — Devi Bhagavata Purana, as taught by Sages
Name 958 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
The YAMUNĀ or Jumnā river, which rises on the south side of the Himāla range, at a short distance to the north-west of the source of the Ganges, and which after a course of about 3…
Scripturally attestedWhy this matches what you typed
M1 · same meaning "yamunāyai" is the dative of "yamunā" — the same word in a different grammatical case.
Dictionary citations
yamunā f. N. of a river commonly called the Jumnā (in Hariv. & MārkP. identified with Yamī q.v.; it rises in the Himālaya mountains among the Jumnotri peaks at an elevation of 10,849 feet, and flows for 860 miles before it joins the Ganges at Allahabad, its water being there clear as crystal, while that of the Ganges is yellowish; the confluence of the two with the river Sarasvatī, supposed to join them underground, is called tri-veṇī, q.v.), RV. &c. &c.
of a daughter of the Muni Mataṃga, Kathās.
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