Casi \c(a)-si\ as a girl's name is a variant of Casey (Irish, Gaelic), and the meaning of Casi is "alert, watchful".

The baby name Casi sounds like Kasi, Casia, Caysi, Casy, Cass, Casie, Caisi, Caci, Cassi and Cas. Other similar baby names are Cadi, Cai, Cali, Cami, Cari and Cati.