Answer

There is no one fixed surname that means a person is Shwetambar Jain.

Explanation

Shwetambar is a Jain tradition/sect, not a surname. So people from the Shwetambar Jain community can have many different surnames depending on their family, region, and lineage.

Spiritual Understanding

In Jain Dharma, identity is more important through right faith, conduct, and tradition than through surname alone. A surname cannot fully determine whether someone is Shwetambar Jain.

Takeaway

If you want to know whether a person is Shwetambar Jain, the surname alone is not enough. It is better to ask about family tradition or sect.