 The Proto-Indoeuropean root of this presumed name is related to the Iranic word ""/"", while the supposed suffix is encountered in the ancient name of the Ialomița River, "Naparis", and in the unidentified "Miliare" river mentioned by Jordanes in his Getica.Gábor Vékony says that this hypothesis is not plausible, because the Greeks borrowed the "Istros" form from the native Thracians.He proposes that the Romanian name is loanword from a Turkic language (Cuman or Pecheneg).