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Last name Sitja (Sitja , Sitte ) , in the world, is quite a rare surname. The cognomen Sitja is habitual in Austria, where it is quite a rare surname, Germany, and Czechia, where it is a rare surname. Not in comparison with a country's population, it is commonest in Germany, Spain, and Austria. Very seldom, Sitja is the forename as well as the last name.