Last name อ้อย (Oi 
, อ้อย) , in the world, is a common cognomen. The family name อ้อย is characteristic of Malaysia, where it is quite a common surname, Macao, where it is quite a rare surname, and Hong Kong. Measured by absolute frequency, the name is most common in South-eastern Asia, particularly Indonesia, Malaysia, and Myanmar. Likewise, อ้อย is the forename as well as the last name.