Usually compared to Ancient Greek ὄνος (ónos) (which cannot be its direct ancestor), and, just like other IE words for "ass", must be traced back to an unknown substrate source in Asia Minor (compare Hieroglyphic Luwian [script needed] (tarkasna), Sumerian 𒀲 (anše)). The lack of rhotacism of the single intervocalic -s- after a short vowel would point to a recent borrowing.