Shah is a common Jain surname, especially among Gujarati Jains. It is typically a mercantile (trader) lineage name and is used by both Digambar and Śvetāmbara Jains. It is not a religious title or a mark of a specific Jain sect; rather, it reflects family or community lineage within the Jain community. If you’d like, I can look up more specific details from Jain scriptures or traditions.