[ syll. kas-siu(s) , ka-ssi-us ] The baby boy name Kassius is pronounced K AE S-iyAHS â . Kassius is of Latin origin and it is used mainly in German. Kassius is a variant of Cassius (English).Kassius is not popular as a baby boy name. It is not listed within the top 1000. Out of the family of boy names directly related to Kassius, Cassius was the most popular in 2012. syll. kas-siu(s) , ka-ssi-us ] The baby boy name Kassius is pronounced K AE S-iyAHS â . Kassius is of Latin origin and it is used mainly in German. Kassius is a variant of Cassius (English).