God prepared Jewish people throughout their history and moulded them according to His requirement so that they become ready for accepting His Saviour for all the mankind. Even then many of His chosen people failed to recognise Jesus as promised Saviour.
Since Jesus was supposed to be the saviour for all humanity, there is every possibility that God would want to reveal His plan of saving humanity, to other non Jewish people around the world. Hence it is likely that God would make aware to other non-Jewish people also, for a need of a saviour for this world. So it is possible that such revelation did came to many other groups of people around the world, yet the same was most probably misinterpreted in the subset of their geographical as well as regional belief system.
One such instance that comes to my mind is close resemblance in some of the details, between Jesus and Krishna. The recording of these details was close to the period (century) of Prophet Isaiah, when very clear references to birth of Jesus were revealed. While there is no evidence to back up the claim that this story of Krishna was of the events that had already happened, it is surely a shaded reference to Jesus who was to come somewhere in future. It is highly possible that over the years, it was presumed by these groups of people, that whatever was revealed has already come to pass, because of their ignorance of God’s actual plan in that region of the world.
So are there any other such references in non-Jewish traditions where the manifestation Jesus Christ was prophesised?