Jamieson, Fausset and Brown on Acts 18:24-25

24-25. a ... Jew named Apollos--a contraction from Apollonius.

born at Alexandria--the celebrated city of Egypt on the southeastern shore of the Mediterranean, called after its founder, Alexander the Great. Nowhere was there such a fusion of Greek, Jewish, and Oriental peculiarities, and an intelligent Jew educated in that city could hardly fail to manifest all these elements in his mental character.

eloquent--turning his Alexandrian culture to high account.

and mighty in the scriptures--his eloquence enabling him to express clearly and enforce skilfully what, as a Jew, he had gathered from a diligent study of the Old Testament Scriptures.

came to Ephesus--on what errand is not known.