When he heard that Jesus had come out of Judea into Galilee, he went to him, and begged him that he would come down and heal his son, for he was at the point of death.
The word Christ is a Greek word. It is the translation into Greek of the Hebrew word Messiah. And so, you have the Greek word Christ, but it is a word that is the translation of the word Messiah. So John points that out here. "I know that when the Messiah comes," which in Greek is called Christ, Christos.