Cognomen Oay (Oay 
, โอ้) , around the world, is a rare surname. The surname Oay is characteristic of South-eastern Asia, particularly Malaysia, where it is a rare surname, Myanmar, where it is a very rare surname, and Philippines. In absolute terms, this name is the most popular in Malaysia, Myanmar, and China. Likewise, Oay is the forename as well as the last name.