As a deity name
Name 978 of the Vishnu Sahasranāma — Mahabharata (Anushasana Parva), as taught by Bhishma to Yudhishthira on his deathbed
As a Hindi name
Nearest attested word 'यज्ञी' does not appear as a word in our Hindi sources. The nearest word is यज्ञ, meaning yajna, sacrifice, oblation. nearest word: यज्ञ — a suggestion, not a meaning
As a Sanskrit word
Meaning
abounding in sacrifices (said of Viṣṇu)
Scripturally attestedWhy this matches what you typed
M1 · same meaning "yajñī" is the nominative of "yajñin" — the same word in a different grammatical case.
Dictionary citations
yajñin mfn. abounding in sacrifices (said of Viṣṇu), MBh.
yajñin a. Full of sacrifices. — m. N. of Viṣṇu.
Caveats
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