Family name Sieja (Sieja ) , all over the world, is quite a rare cognomen. The last name Sieja is habitual in Poland, where it is quite a rare surname, the United States, where it is a rare surname, and France, where it is a very rare surname. Not in comparison with a country's population, it is commonest in Poland, the United States, and India. Also, Sieja is the forename as well as the last name.