Zipporah was Moses' wife and daughter of Jethro the Midianite. Moses met her after fleeing Egypt when he hit an Egyptian man for killing an Israelite. He sought refuge in the house of Midian (Exodus 2:15-16). She and Moses had two children, Gershon and Eliezer. She circumcised her son Eliezer, after Moses declines to fulfil the obligation (Exodus 4:24).
Sources: Bridger, David. Ed. The New Jewish Encyclopedia, NY: Behrman House, 1976; Navigating the Bible II