Cognomen Pajko (Pajko 
, Пайко 
) , in the entire world, is a rare family name. The surname Pajko is habitual in Serbia, where it is quite a rare surname, Belarus, where it is a rare surname, and Hungary. Measured by absolute frequency, it is commonest in Poland, Serbia, and Russia. Much less frequently, Pajko is the forename as well as the last name.