pariahyoudaoicibaDictYouDict
pariah: [17] Now a general term for an ‘outcast’, pariah came into English from the caste system of southern India. It originally denoted a member of the largest of the lower castes, which was named in Tamil paraiyan. This meant literally ‘drummer’ (it was a derivative of parai ‘large festival drum’), a reference to the hereditary role of the paraiyar (plural) as drummers in festival parades.
caste (n.)youdaoicibaDictYouDict
1550s, "a race of men," from Latin castus "chaste," from castus "cut off, separated; pure" (via notion of "cut off" from faults), past participle of carere "to be cut off from" (and related to castration), from PIE *kas-to-, from root *kes- "to cut" (cognates: Latin cassus "empty, void"). Originally spelled cast in English and later often merged with cast (n.) in its secondary sense "sort, kind, style."

Application to Hindu social groups was picked up by English in India 1610s from Portuguese casta "breed, race, caste," earlier casta raça, "unmixed race," from the same Latin word. The current spelling of of the English word is from this reborrowing. Caste system is first recorded 1840.
DalityoudaoicibaDictYouDict
"(In the traditional Indian caste system) a member of the lowest caste", Via Hindi from Sanskrit dalita 'oppressed'.