Matthew 16:14

And they said, some say that thou art John the Baptist
It was the opinion of some of the Jews, that he was John the Baptist risen from the dead. This notion was spread, and prevailed in Herod's court, and he himself, at last, gave into it.

Some Elias;
the Tishbite, because an extraordinary person was prophesied of by Malachi, under the name of Elias; and who was to come in his power and spirit before the great day of the Lord; and it being a prevailing notion with the Jews, that Elias was to come before the Messiah; (See Gill on Matthew 11:14) they concluded that he was now come:

and others Jeremias;
this is omitted both by Mark and Luke; the reason why he is mentioned, is not because of what is said of him, in ( Jeremiah 1:5 Jeremiah 1:10 Jeremiah 1:18 ) but because the Jews thought he was that prophet spoken of, in ( Deuteronomy 18:15 ) that should be raised up from among them, like unto Moses: and this is the sense of some of their writers ^F7: and in their very ancient writings a parallel is run between Moses and Jeremy ^F8.

``R. Judah, the son of R. Simon, opened ( Deuteronomy 18:18 ) ( 34:10 ) thus: "as thee", this is Jeremiah, who was, as he, in reproofs; you will find all that is written of the one, is written of the other; one prophesied forty years, and the other prophesied forty years; the one prophesied concerning Judah and Israel, and the other prophesied concerning Judah and Israel; against the one those of his own tribe stood up, and against the other those of his own tribe stood up; the one was cast into a river, and the other into a dungeon; the one was delivered by means of an handmaid, and the other by the means of a servant; the one came with words of reproof, and the other came with words of reproof.''

Or one of the prophets;
one of the ancient ones, as Hosea, or Isaiah, or some other: they could not fix upon the particular person who they thought was risen from the dead, and did these wondrous works among them. From the whole it appears, that these persons, whose different sentiments of Christ are here delivered, were not his sworn enemies, as the Scribes and Pharisees, who could never speak respectfully of him; saying, that he was a gluttonous man, a winebibber, a friend of publicans and sinners, a very wicked man, and far from being one, or like one of the prophets: they sometimes represent him as beside himself, and mad, yea, as being a Samaritan, and having a devil, as familiar with the devil, and doing his miracles by his assistance; but these were the common people, the multitude that followed Christ from place to place, and had a great opinion of him on account of his ministry, and miracles: wherefore, though they could not agree in their notions concerning him, yet each of them fix upon some person of note and worth, whom they took him for; they all looked upon him as a great and good man, and as a prophet, as John the Baptist was accounted by all the people, and as one of the chief of the prophets, as Elias and Jeremiah; and they that could not fix on any particular person, yet put him into the class of the prophets: but still they came short of the true knowledge of him; they did not know him to be a divine person, which his works and miracles proved him to be: nor to be that prophet Moses had spoken of, who was alone to be hearkened unto, though his ministry was a demonstration of it: nor that he was the Messiah, so much spoken of in prophecy, and so long expected by the Jewish nation, though he had all the characters of the Messiah meeting in him. The chief reason why they could not entertain such a thought of him, seems to be the mean figure he made in the world, being of a low extract, in strait circumstances of life, regarded only by the poorer sort; and there appearing nothing in him promising, that he should deliver them from the Roman yoke, and set up a temporal kingdom, which should be prosperous and flourishing, which was the notion of the Messiah that then generally obtained: and since they could not, by any means, allow of this character as belonging to Jesus, though otherwise they had an high opinion of him; hence they could not agree about him, but formed different sentiments of him; which is usually the case in everything, where the truth is not hit upon and received.