Gap Var Ginnungaga = “The Open Mouth of the Sacred Descendants was (existed)”. From gap = “open mouth” (indicating something ready to swallow something), var = “was”, “existed”, ginnr = “sacred” and unga = genitive plural of ungr = “descendant”, “child”, “lineage”.
Maria Kvilhaug in The Poetic Edda p. 6 (note 5)