What does Cassian mean?
Cassian has 1 feminine form: Cassia.
Cassian is an unusual given name for men and also an unusual surname for all people. (2000 U.S. Census)
Below is a graphed analysis of the usage of Cassian and associated names. Prominent alternative forms of Cassian (#unlisted) rated in the Top 1000 are Cash (#275 in 2014) and Cassius (#704). These boy names were at the peak of their popularity in 2014 (usage of 0.5105%). Cash (#275) and Cassius (#704) are two of the more fashionable names for newborns in this list, with Cassius having a rebound in usage. (2014 Birth Statistics)
A recommended similar baby name is Caspian. Like Cassian, this name is not commonly used.