In Jain tradition there is no specific “purbaj” (single original ancestor) mentioned in śāstras for the Gangerwal / Gangerawal Jains.

A few important points:

1. “Gangerwal” is a community / social surname, not a classical Jain gotra from scriptures

- Ancient Jain texts talk about gotras of munis and gaṇas, not about modern business communities and surnames. - Names like Oswal, Porwal, Khandelwal, Bagherwal, Gangerwal etc. are mostly regional / social identities that formed much later in history.

1. Who are the “purbaj” then?

- For most such Jain communities, the true “purbaj” in a religious sense are: - The Tīrthaṅkars (especially the one your family has special devotion to), and - The Acharyas / munis under whose influence that local community accepted Jain Dharma. - Historically, the first Gangerwal families would have been local Vaiśya / Kṣatriya families (traders, land‑owners, etc.) who accepted Jainism under guidance of Jain sadhus. - Exact historical names are not preserved in canonical Jain scriptures, and usually even community records do not agree fully.

1. Gotra vs. surname

- In Jain dharma, marriage rules etc. are based on gotra / kul, not on the outside surname. - So if your family is “Gangerwal”, your real Jain gotra / kul is whatever your elders say in: - pūjā-pāṭh, - lagna‑patrikā, - or when doing nāmdān / sankalp. - Different Gangerwal families may belong to different gotras depending on whether they were originally Oswal, Porwal, Agrawal, etc. and which lineage adopted Jain dharma.

1. Religious view in simple words

- Scripturally, the safest answer is: - Your ultimate spiritual purvaj are the Tīrthaṅkars and the siddha‑bhagwāns. - Your community‑purbaj (first Gangerwal Jains) were historical householders who took refuge in Jain dharma, but their exact names are not fixed or given in Jain āgamas.

If you want more detail specifically on Gangerwal Jain gotra and community background, you can see a related discussion here: