In Jain society, “Chandaria” is generally:

• A surname / family name, mainly among Gujarati–Kutchi Jains (many families now in East Africa, UK, etc.).
• It is not a traditional Jain “gotra” name like the well‑known Khandelwal, Oswal, Porwad gotras (e.g. Dugar, Bachhawat, etc.).

In many Gujarati Jain groups, people commonly use family surnames (like Shah, Mehta, Chandaria, Gada, etc.) instead of clearly mentioning an old gotra.

From the point of view of Jain dharma:

• Gotra or surname is only a worldly identity used for lineage and marriage matching.
• Spiritually, Jain philosophy teaches that “I am ātmā (soul), beyond caste, gotra, country or surname.”
• For spiritual progress (samayik, pratikraman, vrata, guṇa‑vruddhi), gotra or surname has no role.

So:

• Yes, many Chandaria families are Jains.
• “Chandaria” itself is better understood as a surname of Jain families, not as a core religious category in Jainism.