Kezia \k(e)-zia\ as a girl's name is pronounced ke-ZYE-ah. It is of Hebrew origin, and the meaning of Kezia is "cassia tree". Cassia is the generic name for a variety of trees and shrubs, one of which produces cinnamon. Biblical: one of the three fair daughters of Job. The name was adpoted by the Puritans and introduced to America in the 18th century.