As a deity name
Name 965 of the Vishnu Sahasranāma — Mahabharata (Anushasana Parva), as taught by Bhishma to Yudhishthira on his deathbed
As a Hindi name
Nearest attested word 'एकात्मा' does not appear as a word in our Hindi sources. The nearest word is एकात्म, meaning एकहृदय । एकप्राण । अभिन्न. — Śabdasāgara nearest word: एकात्म — a suggestion, not a meaning
As a Sanskrit word
Meaning
the one spirit
Scripturally attestedWhy this matches what you typed
M1 · same meaning "ekātmā" is the nominative of "ekātman" — the same word in a different grammatical case.
Dictionary citations
ekātman m. the one spirit, MāṇḍUp.
ekātman mfn. depending solely on one's self, being without any friend, only, alone, MBh.
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