“But I tell you the truth, it is to your advantage that I am going away. For if I do not go away, the Periqlytos will not come to you, but if I go, I will send him to you. And when he comes, he will convict the world for the sin. He will not speak from his own authority, but rather from whatever he will hear (from God). He will communicate with you, lead you with the truth and tell you about the things to come.” [John 16:7 and following verses]

There is a difference of opinion over the interpretation of the Greek word, Periqlytos. According to some, it stands for the consoler, the protector or the one who praises more often. According to others, it is an Aramaic word meaning the redeemer from curse.

It was common among the believers at that time to refer to the last Prophet. It is said that it is a Greek word which literally means Ahmad or Muhammad in Arabic. The words “Muhammiduh” and “Hamidah” (both derived from praise) occur in the original Aramaic texts of the Gospel and they are equivalent to Muhammad and Ahmad in Arabic.

This latter interpretation given to the Greek word Periqlytos is most likely correct because Allâh Almighty mentioned (the Arabic equivalent of) it plainly on the tongue of Jesus [peace be upon him] in the Qur’an saying (what means): {“and bringing good tidings of a messenger to come after me, whose name is Ahmad."} [as-Saff 6]. This is one of the strongest proofs for the Prophethood of Muhammad [peace be upon him] and the fact that the Qur’an is a Divine revelation since Muhammad [peace be upon him] was not to know that the Greek word Periqlytos[1] means Ahmad in Arabic except from Divine revelation. This is indeed a decisive and final proof because the Greek name ‘Periqlytos’ is literally equivalent to the Arabic names Ahmad and Muhammad.

It is astonishing that the revelation makes a differentiation between both forms of Ahmad and Muhammad on one hand even though this unique name has never been given to anyone before him (the Prophet Muhammad).[2] This name was miraculously reserved for the last of the Prophets and Messengers and the worthiest of praise. In other words, neither the Greek ‘Periqlytos’ has ever been given to anyone among the Greeks nor the Arabic Ahmad to anyone among the Arabs before the Prophet Muhammad [peace be upon him]. It is true that Periqlys was the name of a well-known Greek person from Athens, but it means the famous rather than the most famous.[3]

Mr. ‘Abd-Al-Wahhâb an-Najjâr[4] once asked Nallino[5], the Italian Orientalist, about the meaning of ‘Periqlytos’, and he said: “The bishops say that it means the consoler.” He further said: “But I am asking Dr. Nallino, who earned a Ph.D. in ancient Greek Linguistics, and not a bishop.” He said: “It means the one who praises more and more.” He asked him: “Does this agree with the superlative form of praise (more praising/Ahmad)?” He answered in the affirmative, thereupon he said: “Ahmad is one of the names of The Messengers of Allâh [peace be upon him].” He said: “O my brother! You seem to have a good strong memory.” Commenting on that, Mr. an-Najjâr said: “Then, I left him with stronger certainty about the significance of Allâh’s saying (what means): {“and bringing good tidings of a messenger to come after me, whose name is Ahmad."} [as-Saff 6][6]

https://en.islamstory.com/en/artical/25682