Casia \c(a)-sia\ as a girl's name is a variant of Acacia (Greek), and the meaning of Casia is "thorny tree".

The baby name Casia sounds like Casha, Cacia, Casie, Casi, Cassia, Kasia and Catia. Other similar baby names are Tasia, Basia, Camia, Cesia, Nasia and Rasia.