Generally you can tell by the person’s last name. Especially if they are north indian.
In the south its also possible but more tricky as the surname tends to be the fathers’s name and not an ancestral name that gets carried down.
In the south its also possible but more tricky as the surname tends to be the fathers’s name and not an ancestral name that gets carried down.
[0] - https://www.momjunction.com/articles/brahmin-caste-surnames-...
You can look at common conventions here: https://en.wikipedia.org/wiki/Indian_name