Kassja \k(a)-ss-ja\ as a girl's name is a variant of Acacia (Greek), and the meaning of Kassja is "thorny tree".

The baby name Kassja sounds like Kassia and Kasja. Other similar baby names are Kassy, Tasja, Basja, Kassie, Kassi, Cassia, Kassey, Kasse, Kasya, Kass, Kaska, Kaija, Kadija and Rasja.