Cognomen Pijak (พิจักษณ์ 
, Pijak 
, Пияк 
) , all around the world, is a rare family name. The surname Pijak is characteristic of Eastern Europe, particularly Slovakia, where it is quite a rare surname, Czechia, where it is a rare surname, and Ukraine. Measured by absolute frequency, this name is the most popular in Eastern Europe, particularly Slovakia, Russia, and Czechia. More prevalently, Pijak is the forename as well as the last name.