Comment by plinkplonk

Tamil Brahmins usually use the father's first name as the last name for the child.

so wheras in the North, you'd have Narayan Sharma's son being named Vishal Sharma, in Tamil Nadu Sriram Narayan's son would be Vishal Sriram.

So yes, the system does exist

Due Disclosure: South Indian, not a Brahmin, but I have many friends whose names follow this system.