Surname Кастанья (Castagna 
, Кастанья 
) , all around the world, is a common family name. The surname Кастанья is characteristic of Aland Islands, where it is quite a common surname, Malta, and Italy. Measured by absolute frequency, it is the most numerous in Italy, the United States, and Argentina. Very seldom, Кастанья is the forename as well as the last name.