From Elamite 𒋾𒅅𒊏 (ti-ig-ra), from Sumerian 𒀀𒇉𒈦𒄘𒃼 (ÍDIdigna, ÍDIdigina, literally “fast as an arrow”), because the Tigris is rough and fast flowing compared to the neighboring Euphrates.
𐎫𐎡𐎥𐎼𐎠 (t-i-g-r-a /Tigrā/) m