As a deity name
Name 347 of the Ganesha Sahasranāma — Ganesha Purana (Upasana Khanda), as taught by Sage Vyasa / Lord Ganesha
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
uc-chiṣṭa—gaṇapati or uc-chiṣṭa—gaṇeśa, (opposed to śuddha-gaṇapati), Gaṇeśa as worshipped by the Ucchiṣṭas (or men who leave the remains of food in their mouth during prayer), &c.
Scripturally attested Verified derivationMultiple readings (2)Why this matches what you typed
The spelling you confirmed, उच्छिष्टगणेश, is itself a dictionary headword — no grammatical transformation stands between what you typed and the meaning above.
Dictionary citations
uc-chiṣṭa—gaṇapati or uc-chiṣṭa—gaṇeśa, m. (opposed to śuddha-gaṇapati), Gaṇeśa as worshipped by the Ucchiṣṭas (or men who leave the remains of food in their mouth during prayer), Tantras. &c.
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