Last name Kasja (Kasja 
, Кася 
, Κασσιανή 
) , around the globe, is a rare family name. The family name Kasja is characteristic of Armenia, where it is quite a rare surname, Indonesia, where it is a very rare surname, and Israel. Not in comparison with a country's population, it most frequently occurs in Indonesia, Armenia, and Russia. Likewise, Kasja is the forename as well as the last name.