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All over the world, Кассиан (Cassian , Cassianus , Кассиан ) is quite a rare boy's forename. The first name Кассиан is characteristic of Tanzania, where it is quite a rare masculine name, Sri Lanka, where it is a rare boy's name, and Romania. Not in comparison with a country's population, it is the most numerous in Tanzania, Sri Lanka, and India. Also, Кассиан is the last name as well as the forename.
Кассиан is also a name for the fictitious and mythical characters: Cassian Andor , the character from Star Wars, Rogue One and Cassian , the operatic character in the opera Des Adlers Horst.