[miscaccount]

not really, many of the states does not use last name and many take up their fathers name as last name. It also varies from state to state, so the probability of you identifying another person caste from their last name is very small.

With many people taking different names that are modern from parents ,its really hard to know .

[theogravity]

My wife has her father's name as her last, so what you say definitely tracks.