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This hypothesis originates from the Roman Grammarian Maurus Servius Honoratus. However, the Greek verb descends from the Proto-Indo-European root*srew- (compare Ancient Greek ῥεῦμα (rheûma) 'a stream, flow, current', the Thracian river name Στρυμών (Strumṓn) and Proto-Germanic *strauma- 'stream'; if it was related, however, the Latin river name would be expected to begin with *Frum-, like Latin frīgeō 'to freeze' from the root *sreyHg-) and the Latin verb from *h₃rew-.
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