Family name อ่อย (Oi 
, Aoi 
, อ่อย) , in all the world, is a common cognomen. The family name อ่อย is habitual in Malaysia, where it is quite a common surname, Macao, where it is quite a rare surname, and Hong Kong. In absolute terms, it is commonest in Indonesia, Malaysia, and Nigeria. Also, อ่อย is the forename as well as the last name.