Cognomen Piljan (Piljan 
) , in all the world, is a rare surname. The last name Piljan is characteristic of Croatia, where it is quite a rare surname, Slovakia, where it is a rare surname, and France, where it is an extremely rare surname. Not in comparison with a country's population, the name is most common in Croatia, Slovakia, and India. Very seldom, Piljan is the forename as well as the last name.