Short answer:

• Rishabhanatha (also called Adinath) is considered the very first Tirthankar in Jainism.
• Some Jain communities use the term “Rishabha gotra” to indicate a family lineage claimed to descend from or be inspired by Rishabhanatha. This is a social/clan designation rather than a formal scriptural category.
• In the traditional Jain lineage, Rishabhanatha’s son is Bharata, and his grandson is Bahubali. Bharata is known for initiating the Bharata dynasty; Bahubali is famous for renouncing worldly life and attaining spiritual realization.
• The idea of gotras in Jainism is not as systematized or uniform as in some other traditions, and there are variations between Digambar and Śvetāmbara communities. Some groups emphasize lineages connected to Tirthankaras (including Rishabhanatha) more than others.
• Because Jain practices and clan names can vary by region and community, there isn’t a single universal “Rishabha gotra” profile that applies to all Jains.

If you’d like, I can share more on how Digambar and Śvetāmbara traditions describe Rishabhanatha and his descendants, or point to specific Jain scriptures that mention his lineage.