Group II
Words from Tamil aruvi evolved out of *rei-’s phonetic forms riv, rin, rai, ruh, and reh
*rei-’s base forms in the West Indo-European languages found in the Online Etymology Dictionary and other dictionaries are given below:
Vulgar Lat. riparia ‘shore,’ Lat. ripa ‘shore,’ rivus ‘stream’; Gaul. renos ‘that which flows;’ G. rannjan, ryne ‘a stream;’ Proto-G. renwanan ‘to run.’
Etymological development of Tamil aruvi:
ar → aru → aruvi ‘river, waterfall’ → rive;
aruvi ‘river, waterfall’ → *rei- ‘to flow, to run’ → rine, rai, ruh, reh
Note: The word arrive is directly derived from Tamil aruvi; *rei- ‘to scratch, tear, cut,’ the given root of the word mentioned in the Online Etymology Dictionary, is semantically inappropriate.