Cognomen Пяйви (Päivi 
, Rasanen 
, Пяйви 
) , in the world, is quite a common family name. The surname Пяйви is habitual in Finland, where it is a common surname, Reunion, where it is quite a common surname, and Estonia, where it is quite a rare surname. Measured by absolute frequency, it is commonest in Finland, South Korea, and the United States. Likewise, Пяйви is the forename as well as the last name.