Family name บ้วย (Buai 
, บ้วย) , in the world, is a rare surname. The surname บ้วย is habitual in Malaysia, where it is a rare surname, Myanmar, where it is a very rare surname, and Nigeria, where it is an extremely rare surname. In absolute terms, it is commonest in Malaysia, Myanmar, and China. Also, บ้วย is the forename as well as the last name.