The name Ichthus comes from the Greek IXOYE which is an acronym for Iesous Christos, Theou Yios, Soter.
Translated from the Greek IXOYE means "Jesus Christ, Son of God, Saviour".
Essay Collection. Faith, Christianity and the Church by C. S. Lewis, Edited by Lesley Walmsley [STL9780007136537]