In Jainism, the word you wrote “gyangach” doesn’t directly match any well‑known, standard term, but it looks like a mistaken or colloquial form of:

• “Gyan” (Jñān) = knowledge
• “Gacchh / Gaccha” = a monastic order/lineage within Śvetāmbara Mūrtipūjak Jains

So people sometimes informally say things like “X‑gacchh” for a particular Jain sect/lineage, for example Upkeś Gacchh, Kharatargaccha, Tapāgaccha, etc. Each “gacchh” is a traditional guru‑paramparā (line of ācāryas and sādhus), not a different religion, but a different order within Jainism with its own discipline, customs and history.

There is no widely recognized separate Jain sect formally called “Gyan Gacchh / Gyangach” in the major traditional lists. It is likely:

• a spelling or pronunciation error for some other named Gacchh, or
• a very local/limited usage for a group, not a classical, scripturally‑attested division.

In Jain Dharma, true “Gyan” (Samyak Jñān) itself is one of the Three Jewels (Samyak Darshan, Samyak Jñān, Samyak Chāritra) and means right, non‑deluding, non‑contradictory knowledge, free from doubt and wrong belief. You can read a simple explanation of right knowledge here: