Last name โอ้ย (Oi 
, Oai 
, โอ้ย) , all around the world, is a common cognomen. The last name โอ้ย is characteristic of Malaysia, where it is quite a common surname, Macao, where it is quite a rare surname, and Hong Kong. In absolute terms, it most frequently occurs in South-eastern Asia, particularly Indonesia, Malaysia, and Myanmar. Likewise, โอ้ย is the forename as well as the last name.