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Across the world, Cassian (Cassian , Cassianus , קסיאן ) is quite a rare male first name. The forename Cassian is habitual in Tanzania, where it is quite a rare male name, Sri Lanka, where it is a rare boy's name, and Romania. Measured by absolute frequency, it most frequently occurs in Tanzania, Sri Lanka, and India. Also, Cassian is the last name as well as the forename.
Cassian 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.