As a deity name
Name 268 of the Vishnu Sahasranāma — Mahabharata (Anushasana Parva), as taught by Bhishma to Yudhishthira on his deathbed
As a Hindi name
महेन्द्र · mahendra · s.m.
Great Indra (the great ruler of the celestial regions) — Platts (1884), digital edition courtesy DSAL, University of Chicago, p. 1103
As a Sanskrit word
Meaning
the great Indra, &c. &c. (also applied to Viṣṇu and Śiva )
Scripturally attested Verified derivationMultiple readings (3)Why this matches what you typed
M1 · same meaning "mahendra" is the vocative of "mahendrā" — the same word in a different grammatical case.
Dictionary citations
mahendra m. the great Indra, AV. &c. &c. (also applied to Viṣṇu [R.] and Śiva [Śivag.])
a partic. star, VP.
a great chief or leader (sarva-devānām), Nal.
a partic. high number, Buddh.
N. of a younger brother (or son) of Aśoka (who carried the Buddhist doctrine into Ceylon), MWB. 59
mahendrā f. N. of a river, MBh.
Alternative readings
More than one analysis survives full verification. That ambiguity is real, so we show every reading rather than pick one silently.
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