[coopsmgoops]

Names possibly? I'm purely speculating here, but since India has such a huge population anyone with a indianesque name is probably Indian. Especially if it's the case that muslims from pakistan have distinct names. ¯\_(ツ)_/¯

[nsenifty]

Name is not a reliable indicator of caste for all Indians. A large portion of South Indians don't have a surname - they just use their dad's first name or the name of their hometown. Even among North Indians who do have a caste-based surname, many ditch that in favor of something like "Kumar".