In Jain tradition, marriage is usually avoided only when there is a close blood relation or when the same gotra/kul lineage is considered too closely related by your samaj’s rules.

From what you wrote:

• Your father’s side: Baid
• Your mother’s side: Shyamsukha
• The boy’s family: Shyamsukha

So, being from the same surname/clan name alone does not automatically mean you are extended family. What matters is whether there is a direct family connection on your mother’s side to his family, or whether your community treats the same lineage as restricted for marriage.

Simple rule:

• If the boy is from the same distant clan name only, and there is no common ancestor / no close relation, it is usually considered acceptable in many communities.
• If there is a real family link through the maternal side, then it should not be done.

Best Jain approach:

1. Check both family trees properly.
2. Ask elders of both families.
3. Follow your local Jain samaj’s marriage rules.

So, surname alone is not enough to say yes or no. The deciding factor is the actual family relationship and samaj custom.