Last name Plaina (ธรรมดา 
, Plaina 
) , all around the world, is quite a rare surname. The surname Plaina is characteristic of Thailand, where it is quite a rare surname, Venezuela, where it is a very rare surname, and Brazil, where it is an extremely rare surname. Measured by absolute frequency, it is commonest in Thailand, Brazil, and Philippines. Very seldom, Plaina is the forename as well as the last name.