Names in some regions of India correlate strongly with caste. Physical appearance can also be somewhat suggestive. There are however regions in India that have given up the use of last names are adopted new last names as a counter to casteism. Diet also tends to be somewhat indicative - in regions without high prevalence of vegetarianism, castes with high ritual status tend to be vegetarian.
A barrier to casteism in the diaspora (and in higher class circles in cosmopolitan cities in India) is that an Indian from one region of India is unlikely to know the last names of Indians from other regions of India. Likewise with diet, many Brahmins from a vegetarian background adopt a non-vegetarian diet so it's really not a useful distinguisher.
FWIW, I haven't perceived any casteism in tech companies, or anyone trying to ask my caste, and I have an ambiguous last name and eat a meat-heavy diet. There's a decent chance my experiences would be different if I worked in less elite tech companies (e.g. Cisco) rather than top startups / FAANGs.
A barrier to casteism in the diaspora (and in higher class circles in cosmopolitan cities in India) is that an Indian from one region of India is unlikely to know the last names of Indians from other regions of India. Likewise with diet, many Brahmins from a vegetarian background adopt a non-vegetarian diet so it's really not a useful distinguisher.
FWIW, I haven't perceived any casteism in tech companies, or anyone trying to ask my caste, and I have an ambiguous last name and eat a meat-heavy diet. There's a decent chance my experiences would be different if I worked in less elite tech companies (e.g. Cisco) rather than top startups / FAANGs.