Meaning Kaci is variant of the English "Casey" and means "descendant of the vigilant one". Origin of Kaci Celtic , Irish +-100%Zoom level changed to 1 Popular Middle Names Michelle, Leigh, Marie, Mikaela, Skye, Xoe, Ann, Anne, Elle, Emilee Pronunciation 🔊 Listen Kaci Ka-ci Similar Names Kaycee Cassey Kaycie Kacie Kasie Kacee Kacia Kaesha K.C. Kayce Year by Year Popularity of Kaci