The eunuch (Matt. 19:12) is an Ethiopian (Hebrew: Cushite), and he had “great authority” (vs. 27) in the imperial palace of the Queen of Ethiopia. Undoubtedly he had brought some of the “treasure” (vs. 27) with him for an offering to the Lord (see John 12:3), exactly as the Queen of Sheba had done many years ago (1 Kings 10). He is reading Isaiah the prophet from a scroll like the “Isaiah Scroll.” (The variations between the New Testament Greek text [vs. 33] and the Old Testament Hebrew are the same variations one finds in quotations such as Matt. 8:17 and Acts 28:27.
So there's your first example of a non-Jewish person converting to Christianity in Acts by receiving the gospel, believing in Jesus Christ, then getting water baptized. (Acts 8:26-40 KJV)