Mentioned in the (original) Tawraah and in the (original) Injeel is their description, not their names
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[48:29]
Muhammad is the Messenger of Allaah; and those with him are forceful against the disbelievers, merciful among themselves. You see them bowing and prostrating [in prayer], seeking bounty from Allaah and [His] pleasure. Their mark is on their faces from the trace of prostration. That is their description in the Tawraah. And their description in the Injeel is as a plant which produces its offshoots and strengthens them so they grow firm and stand upon their stalks, delighting the sowers - so that Allaah may enrage by them the disbelievers. Allaah has promised those who believe and do righteous deeds among them forgiveness and a great reward.The Messenger, the Unlettered Prophet, whom they find written in what they have of the Tawraah and the Injeel
The expression "the Unlettered Prophet" is mentioned twice in The Quraan in the following verses
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[7:150] And when Moossa returned to his people, angry and grieved, he said, "How wretched is that by which you have replaced me after [my departure]. Were you impatient over the matter of your Lord?" And he threw down the tablets and seized his brother by [the hair of] his head, pulling him toward him. [Aaron] said, "O son of my mother, indeed the people oppressed me and were about to kill me, so let not the enemies rejoice over me and do not place me among the wrongdoing people."
[7:156] And decree for us in this world [that which is] good and [also] in the Hereafter; indeed, we have turned back to You." [Allaah] said, "My punishment - I afflict with it whom I will, but My mercy encompasses all things." So I will decree it [especially] for those who fear Me and give zakah and those who believe in Our verses -
[7:157] Those who follow the Messenger, the Unlettered Prophet, whom they find written in what they have of the Tawraah and the Injeel, who enjoins upon them what is right and forbids them what is wrong and makes lawful for them the good things and prohibits for them the evil and relieves them of their burden and the shackles which were upon them. So they who have believed in him, honored him, supported him and followed the light which was sent down with him - it is those who will be the successful.
[7:158] Say, [O Muhammad], "O mankind, indeed I am the Messenger of Allaah to you all, [from Him] to whom belongs the dominion of the heavens and the earth. There is no deity except Him; He (Allaah) gives life and causes death." So believe in Allaah and His Messenger, the Unlettered Prophet, who believes in Allah and His words, and follow him that you may be guided.