Yes, I understand that Christos=Messias (as rendered in the Gospels). But we have taken the Greek word, not the Greek transliteration of the Hebrew word. We are called Christians, not Messians. I don't mean we non-jews. I mean we believers, jew and gentile alike.
Acts 11:19-20, 26 Now they which were scattered abroad upon the persecution that arose about Stephen travelled as far as Phenice, and Cyprus, and Antioch, preaching the word to none but unto the Jews only. And some of them were men of Cyprus and Cyrene, which, when they were come to Antioch, spake unto the Grecians, preaching the Lord Jesus. ... And the disciples [jew and Greek] were called Christians first in Antioch.
And there is a divine reason for that:
Isaiah 28:11-12 For with stammering lips and another tongue will he speak to this people. To whom he said, This is the rest wherewith ye may cause the weary to rest; and this is the refreshing: yet they would not hear.
Matthew 21:41-43, 45 They say unto him, He will miserably destroy those wicked men, and will let out his vineyard unto other husbandmen, which shall render him the fruits in their seasons. Jesus saith unto them, Did ye never read in the scriptures, The stone which the builders rejected, the same is become the head of the corner: this is the Lord's doing, and it is marvellous in our eyes? Therefore say I unto you, The kingdom of God shall be taken from you, and given to a nation bringing forth the fruits thereof. ... And when the chief priests and Pharisees had heard his parables, they perceived that he spake of them.
1 Corinthians 14:21 In the law it is written, With men of other tongues and other lips will I speak unto this people; and yet for all that will they not hear me, saith the Lord.