Last name ต้นอ้อย (Tonaoi 
, ต้นอ้อย, Tonooi ) , in the world, is an extremely rare surname. The surname ต้นอ้อย is characteristic of South-eastern Asia, particularly Thailand, where it is an extremely rare surname. Much less frequently, ต้นอ้อย is the forename as well as the last name.