vaiyai

[Swaminathan Madhuresan]

The Online Tamil Lexicon (Cologne) gives:
 vai 04 sharpness, keenness, point
 vai 05 grass

Does vaiyai hydronym come from 1) to cut asunder the land "sharp"
(vai-nuti-vEl: sharp spear) or 2) grass?

What is the etymology for vaiyai?



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