Zilpah /zil-pah/ [2 sylls.] as a name for girls. Zilpah's root is Hebrew. Zilpah is an alternate spelling of Zilpha (Hebrew). Ziliak is a popular last name.ilpah is a rare given name for women. Zilpah is also a unique surname for all people. (2000 U.S. Census). The only prominent alternative form of Zilpah (not ranked) is Zilpha.