Varangian
‘one of the Northmen who ravaged the Baltic coast in 9c. and by tradition overran part of western Russia and founded a dynasty there’
Lexical development traced from the Tamil root:
Med.Lat. Varangus < Byzantine Gk. barangos < O.Nor. væringi ‘a Scandinavian’ < var- ’pledge, faith’ < O.E. wær ‘agreement, treaty, promise,’ O.H.G. wara ‘faithfulness’ < vuh < were-o- < Tamil uṟu