The name Malthace means Unknown and is of Greek origin. Malthace is a name that's been primarily used for girls.
Malthace was a wife of King Herod the Great, the Roman-appointed king of Judea (37–4 BCE). She was the mother of Archelaus and Antipas. Character in the 1963 novel The Bronze Bow by Elizabeth George Spear. Nicknames for the name Malthace include Mal, Thace, and Thacia.