Ah, this is a fascinating question that gets at the heart of how different people read the Old Testament. It all depends on what you mean by "mention."
Here's the breakdown:
* Direct Name "Jesus": The name "Jesus" itself does *not* appear in the Book of Isaiah. The New Testament Greek name "Ἰησοῦς" (Iēsous), which is transliterated as "Jesus" in English, is a Greek form of the Hebrew name "Yehoshua" (Joshua), and the Aramaic name "Yeshua." None of these names appear in Isaiah.
* Messianic Prophecies: However, *many* Christians believe that Isaiah contains numerous prophecies that were fulfilled by Jesus Christ. These passages describe a future king and deliverer who will bring salvation to Israel and the world. Key examples include:
* Isaiah 7:14: "Therefore the Lord himself will give you a sign: The virgin will conceive and give birth to a son, and will call him Immanuel." (Often interpreted as referring to the virgin birth of Jesus).
* Isaiah 9:6: "For to us a child is born, to us a son is given, and the government will be on his shoulders. And he will be called Wonderful Counselor, Mighty God, Everlasting Father, Prince of Peace." (Seen as describing the divine nature and future reign of Jesus).
* Isaiah 53: (The entire chapter). This is a particularly important passage referred to as the "Suffering Servant" passage. It describes a figure who will be despised, rejected, and ultimately suffer for the sins of others. Christians believe this is a powerful prophecy of Jesus's crucifixion and atoning sacrifice.
* How many times? It's impossible to give a precise number of "mentions" because it depends on how one interprets each passage. Some scholars and believers might identify 10, 20, or even more passages as relevant to Jesus. Others might see fewer.
In summary:
While the name "Jesus" isn't in Isaiah, the book is considered by many Christians to be rich in prophecies pointing to him. The specific number of "mentions" is subjective and based on interpretation.