Perhaps a corrupted form of Proto-Mongolic *hütügün, maybe influenced by атираа (atiraa, “crease”). See regularly inherited үтэг (üteg)
үтрээ • (ütree) (Mongolian spelling ᠦᠲᠦᠷᠦᠭᠡ (ütürüge)); (hidden-n declension)
