“Tannarana” is mainly known as a Lohana community surname (a trading/merchant community, especially in Gujarat and Sindh areas). ( mylohana.com)

Important from a Jain point of view:

• Jainism does not fix any particular surname or caste.
• The same surname (like Tannarana, Vora, Gandhi, etc.) can be used by Hindus, Jains, or even others – it depends on the family’s actual religion and practice, not on the surname itself.
• So, a person with surname Tannarana can be Jain, but the surname by itself does not prove that they are Jain. You must see the family’s dharmic practice (what they follow at home, which temple they go to, etc.).

For a simple explanation of how surnames work in Jainism (they are mainly social/family names, not religious labels), you can read more here: