The original SumerianIdigna or Idigina was probably from *id (i)gina "running water", which can be interpreted as "the swift river", contrasted to its neighbour, the Euphrates, whose leisurely pace caused it to deposit more silt and build up a higher bed than the Tigris. The Sumerian form was borrowed into Akkadian as Idiqlat, and from there into the other Semitic languages (cf. Hebrew Ḥîddeqel, Syriac Deqlaṯ, Arabic Dijlah).
Another name for the Tigris used in Middle Persian was Arvand Rud, literally "swift river". Today, however, Arvand Rud (New Persian: اروند رود) refers to the confluence of the Euphrates and Tigris rivers (known in Arabic as the Shatt al-Arab). In Kurdish, it is also known as Ava Mezin, "the Great Water".
The name of the Tigris in languages that have been important in the region: