Yāska

Yāska (7th–5th century BCE) was an ancient Indian grammarian and Vedic linguist. Preceding Pāṇini (7th–4th century BCE), he is traditionally identified as the author of ''Nirukta,'' the discipline of "etymology" (explanation of words) within the Sanskrit grammatical tradition, and the ''Nighantu'', the oldest proto-thesaurus in India. Nirukta is one of the six Vedāṅgas (limbs of the Veda) in Hinduism. Yaska is widely regarded as the precursive founder of the discipline of what would become etymology in both the East and the West. Provided by Wikipedia