Here's why:
* Surnames can be adopted: People can adopt surnames for various reasons, including marriage, migration, or social status.
* Surnames can have different origins: The surname "Dutta" itself can have different origins within India. It might have been adopted by different communities due to shared occupations, social roles, or other historical reasons.
* Regional differences: While there may be some shared ancestry, Bengali Duttas and Punjabi Duttas have likely experienced distinct historical and cultural influences due to the differences between Bengal and Punjab.
Therefore, it's more accurate to say that Bengali Duttas and Punjabi Duttas share a surname but may not be directly related or share the same origins.
To understand any potential connections, it would be necessary to delve into their family histories and investigate specific family lineages.